Xray XB8 Series User manual

2
INTRODUCTION
The XRAY XB8 is a modern, high-competition premium luxury racing 1/8 nitro
off-road car that is the epitome of high-performance and fine distinctive design.
Your XB8 offers highest performance, responsive handling, and traditionally
exceptional XRAY quality, engineering, and design. The superb craftsmanship and
attention to detail are clearly evident everywhere on the XRAY XB8.
XB8 was designed around a no compromise platform; the attention to detail
creates a low maintenance, extra long life nitro buggy. The ultra-low center
of gravity (CG) and optimized weight balance makes set-up, driving, and
maintenance easy and quick.
The XRAY XB8 was created by blending highest-quality materials and excellent
design. On high-speed flat tracks or bumpy tracks, whether driving for fun or
racing to win, the XB8 delivers outstanding performance, speed, and precision
handling.
We have made every effort to make these instructions as easy to understand as
possible. However, if you have any difficulties, problems, or questions, please
do not hesitate to contact the XRAY support team at [e-mail].
Also, please visit our web site at www.teamxray.com to find the latest updates,
set-up information, option parts, and many other goodies. We pride ourselves on
taking excellent care of our customers.
SAFETY PRECAUTIONS
WARNING: This product contains a chemical known to the state of California to
cause cancer and birth defects or other reproductive harm.
CAUTION: CANCER HAZARD
Wash thoroughly after using. DO NOT use product while eating, drinking or
using tobacco products. May cause chronic effects to gastrointestinal tract, CNS,
kidneys, and blood. MAY CAUSE BIRTH DEFECTS.
When building, using and/or operating this model always wear protective glasses
and gloves.
Take appropriate safety precautions prior to operating this model. You are
responsible for this model‘s assembly and safe operation! Please read the
instruction manual before building and operating this model and follow all safety
precautions. Always keep the instruction manual at hand for quick reference,
even after completing the assembly. Use only genuine and original authentic
XRAY parts for maximum performance. Using any third party parts on this model
will void guaranty immediately.
Improper operation may cause personal and/or property damage. XRAY and
its distributors have no control over damage resulting from shipping, improper
construction, or improper usage. XRAY assumes and accepts no responsibility for
personal and/or property damages resulting from the use of improper building
materials, equipment and operations. By purchasing any item produced by XRAY,
the buyer expressly warrants that he/she is in compliance with all applicable
federal, state and local laws and regulation regarding the purchase, ownership
and use of the item. The buyer expressly agrees to indemnify and hold harmless
XRAY for all claims resulting directly or indirectly from the purchase, ownership
or use of the product. By the act of assembling or operating this product, the user
accepts all resulting liability. If the buyer is not prepared to accept this liability,
then he/she should return this kit in new, unassembled, and unused condition to
the place of purchase.
IMPORTANT NOTES – GENERAL
• This product is not suitable for children under 16 years of age without the direct
supervision of a responsible and knowledgeable adult.
• Carefully read all manufacturers warnings and cautions for any parts used in
the construction and use of your model.
• Assemble this kit only in places away from the reach of very small children.
• First-time builders and users should seek advice from people who have building
experience in order to assemble the model correctly and to allow the model to
reach its performance potential.
• Exercise care when using tools and sharp instruments.
• Take care when building, as some parts may have sharp edges.
• Keep small parts out of reach of small children. Children must not be allowed
to put any parts in their mouth, or pull vinyl bag over their head.
• Read and follow instructions supplied with paints and/or cement, if used (not
included in kit).
• Immediately after using your model, do NOT touch equipment on the
model such as the motor and speed controller, because they generate high
temperatures. You may seriously burn yourself seriously touching them.
• Follow the operating instructions for the radio equipment at all times.
• Do not put fingers or any objects inside rotating and moving parts, as this may
cause damage or serious injury as your finger, hair, clothes, etc. may get caught.
• Be sure that your operating frequency is clear before turning on or running your
model, and never share the same frequency with somebody else at the same
time. Ensure that others are aware of the operating frequency you are using
and when you are using it.
• Use a transmitter designed for ground use with RC cars. Make sure that no one
else is using the same frequency as yours in your operating area. Using the
same frequency at the same time, whether it is driving, flying or sailing, can
cause loss of control of the RC model, resulting in a serious accident.
• Always turn on your transmitter before you turn on the receiver in the car.
Always turn off the receiver before turning your transmitter off.
• Keep the wheels of the model off the ground when checking the operation of
the radio equipment.
• Disconnect the battery pack before storing your model.
• When learning to operate your model, go to an area that has no obstacles that
can damage your model if your model suffers a collision.
• Remove any sand, mud, dirt, grass or water before putting your model away.
• If the model behaves strangely, immediately stop the model, check and clear
the problem.
• To prevent any serious personal injury and/or damage to property, be
responsible when operating all remote controlled models.
• The model car is not intended for use on public places and roads or areas where its
operation can conflict with or disrupt pedestrian or vehicular traffic.
• Because the model car is controlled by radio, it is subject to radio interference
from many sources that are beyond your control. Since radio interference can
cause momentary loss of control, always allow a safety margin in all directions
around the model in order to prevent collisions.
• Do not use your model:
- Near real cars, animals, or people that are unaware that an RC car is being
driven.
- In places where children and people gather
- In residential districts and parks
- In limited indoor spaces
- In wet conditions
- In the street
- In areas where loud noises can disturb others, such as hospitals and
residential areas.
- At night or anytime your line of sight to the model may be obstructed or
impaired in any way.
To prevent any serious personal injury and/or damage to property, please be
responsible when operating all remote controlled models.
FAILURE TO FOLLOW THESE INSTRUCTIONS WILL BE CONSIDERED AS ABUSE AND/OR NEGLECT.
CUSTOMER SUPPORT
XRAY Europe
K Výstavisku 6992
91101 Trenčín
Slovakia, EUROPE
Phone: [phone]
Fax: [phone]
Email: [e-mail]
We have made every effort to make these instructions as easy to understand as
possible. However, if you have any difficulties, problems, or questions, please
do not hesitate to contact the XRAY support team at [e-mail]. Also,
please visit our Web site at www.teamxray.com to find the latest updates, set-up
information, option parts, and many other goodies. We pride ourselves on taking
excellent care of our customers.
You can join thousands of XRAY fans and enthusiasts in our online community at:
www.teamxray.com
XRAY USA
RC America, 2030 Century Center Blvd #15
Irving, TX 75062
USA
Phone: [phone]
Fax: [phone]
Email: [email protected]
IMPORTANT NOTES – NITRO ENGINES
• Always test the brakes and the throttle before starting your engine to avoid
losing control of the model.
• Make sure the air filter is clean and oiled.
• Never run your engine without an air filter. Your engine can be seriously
damaged if dirt and debris get inside the engine.
• For proper engine break-in, please refer to the manual that came with the
engine.
• Do not run near open flames or smoke while running your model or while
handling fuel.
• Some parts will be hot after operation. Do not touch the exhaust or the engine
until they have cooled. These parts may reach 275°F during operation!

3
IMPORTANT NOTES – ELECTRICAL
• Insulate any exposed electrical wiring (using heat shrink tubing or electrical tape)
to prevent dangerous short circuits. Take maximum care in wiring, connecting
and insulating cables. Make sure cables are always connected securely. Check
connectors for if they become loose. And if so, reconnect them securely. Never
use R/C models with damaged wires. A damaged wire is extremely dangerous,
and can cause short-circuits resulting in fire. Please have wires repaired at your
local hobby shop.
• Low battery power will result in loss of control. Loss of control can occur due to a
weak battery in either the transmitter or the receiver. Weak running battery may
also result in an out of control car if your car‘s receiver power is supplied by the
running battery. Stop operation immediately if the car starts to slow down.
• When not using RC model, always disconnect and remove battery.
• Do not disassemble battery or cut battery cables. If the running battery short-
circuits, approximately 300W of electricity can be discharged, leading to fire or
burns. Never disassemble battery or cut battery cables.
• Use a recommended charger for the receiver and transmitter batteries and
follow the instructions correctly. Over-charging, incorrect charging, or using
inferior chargers can cause the batteries to become dangerously hot. Recharge
battery when necessary. Continual recharging may damage battery and, in the
worst case, could build up heat leading to fire. If battery becomes extremely hot
during recharging, please ask your local hobby shop for check and/or repair
and/or replacement.
• Regularly check the charger for potential hazards such as damage to the
cable, plug, casing or other defects. Ensure that any damage is rectified
before using the charger again. Modifying the charger may cause short-circuit
or overcharging leading to a serious accident. Therefore do not modify the
charger.
• Always unplug charger when recharging is finished.
• Do not recharge battery while battery is still warm. After use, battery retains
heat. Wait until it cools down before charging.
• Do not allow any metal part to short circuit the receiver batteries or other
electrical/electronic device on the model.
• Immediately stop running if your RC model gets wet as may cause short circuit.
• Please dispose of batteries responsibly. Never put batteries into fire.
WARRANTY
XRAY guarantees this model kit to be free from defects in both material and
workmanship within 30 days of purchase. The total monetary value under warranty
will in no case exceed the cost of the original kit purchased. This warranty does
not cover any components damaged by use or modification or as a result of wear.
Part or parts missing from this kit must be reported within 30 days of purchase. No
part or parts will be sent under warranty without proof of purchase. Should you
find a defective or missing part, contact the local distributor. Service and customer
support will be provided through local hobby store where you have purchased the
kit, therefore make sure to purchase any XRAY products at your local hobby store.
This model racing car is considered to be a high-performance racing vehicle. As
such this vehicle will be used in an extreme range of conditions and situations,
all which may cause premature wear or failure of any component. XRAY has no
control over usage of vehicles once they leave the dealer, therefore XRAY can only
offer warranty against all manufacturer‘s defects in materials, workmanship, and
assembly at point of sale and before use. No warranties are expressed or implied
that cover damage caused by what is considered normal use, or cover or imply
how long any model cars‘ components or electronic components will last before
requiring replacement.
Due to the high performance level of this model car you will need to periodically
maintain and replace consumable components. Any and all warranty coverage
will not cover replacement of any part or component damaged by neglect, abuse,
or improper or unreasonable use. This includes but is not limited to damage
from crashing, chemical and/or water damage, excessive moisture, improper
or no maintenance, or user modifications which compromise the integrity of
components. Warranty will not cover components that are considered consumable
on RC vehicles. XRAY does not pay nor refund shipping on any component sent
to XRAY or its distributors for warranty. XRAY reserves the right to make the final
determination of the warranty status of any component or part.
Limitations of Liability
XRAY makes no other warranties expressed or implied. XRAY shall not be liable
for any loss, injury or damages, whether direct, indirect, special, incidental, or
consequential, arising from the use, misuse, or abuse of this product and/or any
product or accessory required to operate this product. In no case shall XRAY‘s
liability excess the monetary value of this product.
Take adequate safety precautions prior to operating this model. You are
responsible for this model’s assembly and safe operation.
Disregard of the any of the above cautions may lead to accidents, personal
injury, or property damage. XRAY MODEL RACING CARS assumes no
responsibility for any injury, damage, or misuse of this product during
assembly or operation, nor any addictions that may arise from the use of
this product. All rights reserved.
QUALITY CERTIFICATE
XRAY MODEL RACING CARS uses only the highest quality materials, the best
compounds for molded parts and the most sophisticated manufacturing processes
of TQM (Total Quality Management). We guarantee that all parts of a newly-
purchased kit are manufactured with the highest regard to quality. However, due
to the many factors inherent in model racecar competition, we cannot guarantee
any parts once you start racing the car. Products which have been worn out,
abused, neglected or improperly operated will not be covered under warranty.
We wish you enjoyment of this high-quality and high-performance RC car and
wish you best success on the track!
In line with our policy of continuous product development, the exact specifications of the kit may vary. In the unlikely event of any
problems with your new kit, you should contact the model shop where you purchased it, quoting the part number. We do reserve all
rights to change any specification without prior notice. All rights reserved.
R/C & BUILDING TIPS
• Make sure all fasteners are properly tightened. Check them periodically.
• Make sure that chassis screws do not protrude from the chassis.
• For the best performance, it is very important that great care is taken to ensure
the free movement of all parts.
• Clean all ball-bearings so they move very easily and freely.
• Tap or pre-thread the plastic parts when threading screws.
• Self-tapping screws cut threads into the parts when being tightened. Do not
use excessive force when tightening the self-tapping screws because you may
strip out the thread in the plastic. We recommended you stop tightening a screw
when you feel some resistance.
• Ask your local hobby shop for any advice.
Please support your local hobby shop. We at XRAY Model Racing Cars support all
local hobby dealers. Therefore we ask you, if at all possible, to purchase XRAY
products at your hobby dealer and give them your support like we do. If you
have difficulty finding XRAY products, please check out www.teamxray.com to
get advice, or contact us via email at [e-mail], or contact the XRAY
distributor in your country.
IMPORTANT NOTES – NITRO FUEL
• Handle fuel only outdoors. Never handle nitro fuel indoors, or mix nitro fuel in
a place where ventilation is bad.
• Only use nitro fuel for R/C models. Do not use gasoline or kerosene in R/C
models as it may cause a fire or explosion, and ruin your engine.
• Nitro fuel is highly inflammable, explosive, and poisonous. Never use fuel
indoors or in places with open fires and sources of heat.
• Always keep the fuel container cap tightly shut.
• Always read the warning label on the fuel container for safety information.
• Nitro-powered model engines emit poisonous vapors and gasses. These vapors
irritate eyes and can be highly dangerous to your health. We recommend wearing
rubber or vinyl gloves to avoid direct contact with nitro fuel.
• Nitro fuel for RC model cars is made of the combination of the methyl alcohol,
castor or synthetic oil, nitro methane etc. The flammability and volatility of these
elements is very high, so be very careful during handling and storage of nitro
fuel.
• Keep nitro fuel away from open flame, sources of heat, direct sunlight, high
temperatures, or near batteries.
• Store fuel in a cool, dry, dark, well-ventilated place, away from heating devices,
open flames, direct sunlight, or batteries. Keep nitro fuel away from children.
• Do not leave the fuel in the carburetor or fuel tank when the model is not in
use. There is danger that the fuel may leak out.
• Wipe up any spilled fuel with a cloth.
• Be aware of spilled or leaking fuel. Fuel leaks can cause fires or explosions.
• Do not dispose of fuel or empty fuel containers in a fire. There is danger of
explosion.

4
To ensure that you always have access to the most up-to-date
version of the XRAY Set-up Book, XRAY will now be offering only
the digital online version at our website at www.teamxray.com.
By offering this online version instead of including a hardcopy
printed version in kits, you will always be assured of having the
most current updated version.
SYMBOLS USED
L=R
2x
CA
OIL
Part bags used Assemble left and
right sides the
same way
Assemble in the
specified order
Pay attention
here
Assemble as
many times
as specified
(here twice)
Apply instant
glue
Cut off shaded
portion
Cut off
remaining
material
Tighten screw
gently
EQUIPMENT REQUIRED
TOOLS & EQUIPMENT INCLUDED NOT INCLUDED
Assemble front
and rear the same
way
Apply oil
Use special
tool
Silicone Shock Oil
(HUDY #106331 300cSt 100ml)
(HUDY #106341 400cSt 100ml)
Silicone Diff Oil
(HUDY #106431 3000cSt 100ml)
(HUDY #106451 5000cSt 100ml)
(HUDY #106471 7000cSt 100ml)
Air Filter Oil
(HUDY #106240)
Receiver Pack
Transmitter .21ci (3.5cc) Engine
(FX K5 DC #650301)
Manifold
(FX #659706)
Exhaust
(FX #659503)
Glow Plug IgniterStarter Box & Battery Pack
(HUDY #104500)
Steering and
Throttle Servos
Battery Charger
Receiver
Lexan™ PaintFuel + Fuel Bottle
(HUDY #104200)
CA Glue
➊ ➋ ➌
Apply grease Apply
threadlock
Ensure smooth
non-binding
movement
Use pliers Follow tip here
Graphite Grease
(HUDY #106210)
Transmitter Batteries
Threadlock
Follow Set-up
Book
Use cleaner
or WD-40®
Time
BOOK
SET-UP
BOOK
SET-UP
TOOLS REQUIRED
Special Tool for all turnbuckles,
nuts (HUDY #181090)
Turnbuckle Wrench
(HUDY #181040 4mm)
(HUDY #181050 5mm)
Phillips 5.0mm
(HUDY TOOLS)
Socket 5.0/5.5mm
(HUDY TOOLS)
Allen 1.5/2.0/2.5/3.0mm
(HUDY TOOLS)
17mm Wheel Nut Tool
(HUDY #107570)
Side Cutters
(HUDY #189010)
Body Reamer
(HUDY #107600)
or
(HUDY #107601)
Cross Wrench
(HUDY #107581)
Flywheel Tool
(HUDY #182015)
Scissors
(HUDY #188990)
Needle Nose Pliers
(HUDY #189020)
Snap Ring Pliers
(HUDY #189040)
Arm Reamer 3mm/4mm
(HUDY TOOLS)
Ball Allen 2.5mm
(HUDY TOOLS)
Professional Multi Tool
(HUDY #183011)
Pocket Hobby Knife
(HUDY #188981)

5
XB8 TECH TIPS
If there is too much or too little diff side play, this may create non-optimal gear mesh between the diff gear and the pinion drive gear. This is easily resolved by inserting 1 or 2 of the included thin shims behind a diff
outdrive ball-bearing, depending on how much play there is.
FRONT & REAR DIFF GEAR MESH ADJUSTMENT
THE LOCATION OF THE SHIM(S) DEPENDS ON WHETHER YOU ARE TRYING TO CLOSE OR OPEN THE GAP:
TO CLOSE A WIDE GAP
TO OPEN A NARROW GAP
TIP
insert shim(s) here
insert shim(s) here
DRIVE SHAFT PIN SERVICING
TIP
To enjoy the longest possible lifespan of the drive shafts and diff outdrives, it is extremely important to properly service the drive shaft pins.
Inspect the pins after every 3 hours of runtime. If the pins show any wear, replace them with new pins.
For easy drive pin replacements use #106000
HUDY Drive Pin Replacement Tool.
To replace the worn pins use only
premium HUDY drive pins #106050.
Do not use drive shafts
when the pins are worn.
Press out the worn pins. Press in new pins and
regularly inspect for wear.
To CLOSE a wide gap:
add 1 or 2 shims against diff spur gear
To OPEN a narrow gap:
add 1 or 2 shims on the other side of the diff, away from spur gear
TO OPEN A NARROW GAP
TO CLOSE A WIDE GAP
#962130 S 13 x 16 x 0.2 mm (10)
#962131 S 13 x 16 x 0.1 mm (10)
WASHER
SUSPENSION & DRIVETRAIN MAINTENANCE
• Check suspension for free movement during building and operation, and especially after running
and if you have crashed the car. If the suspension does not move freely, use the appropriate HUDY
Arm Reamer to clean and resize the holes of the suspension arms.
• Regularly check the drive shaft pins (both side and center) and if they show any wear must be
immediately replaced by new pins. If the car is run with worn pins, excessive wear on the diff
outdrives will result. The 106000 HUDY Drive Pin Replacement Tool (for 3mm Pins) is a compact,
rugged multi-use tool set for replacing 3mm drive pins in drive shafts. Use the HUDY replacement
drive shaft pins 3x14 (#106050).
• Regularly inspect and replace the connecting pins which connect the center drive shafts with the
pinion gear, and also the pins that connect the wheel drive shafts with wheel axles. Use HUDY
Graphite Grease to lubricate the drive shaft connecting joints and the diff gears.
• Pivot balls and ball-joints will naturally wear for some time and will generate play. If there is too
much play the pivot balls and ball joints need to be replaced.
• If the car is run in wet conditions, apply WD-40® on all drivetrain parts before the run. After the
run, clean and dry the parts again.
HUDY SPRING STEEL™
The HUDY Spring Steel™ used in the car is the strongest and most durable steel material on the RC market. While items made from HUDY Spring Steel™ are still subject to wear, the lifespan is considerably
longer than any other material. As parts made from HUDY Spring Steel™ wear, the brown color will after some time “go down” but it will not affect the strength of the material. The brown color is only a
surface treatment and if the brown color will wear the durability of the part will be still strong.

6
DIFFERENTIAL GEARS
1. FRONT & REAR DIFFERENTIALS
2x
F=R
STEP DETAIL
➊
➋
➌
➍
➎
➎
➎➏
➏
355004 XB8 FRONT DIFFERENTIAL 46T - V2 - SET
355005 XB8 REAR DIFFERENTIAL 46T - V2 - SET
355022 DIFFERENTIAL CASE - V2
355031 STEEL DIFF BEVEL & SATELLITE GEARS - V2 (2+4)
355046 FRONT/REAR DIFF LARGE BEVEL GEAR 46T - HUDY STEEL
355064 FRONT DIFF OUTDRIVE ADAPTER LONG - V2 - HUDY SPRING STEEL™ (2)
355065 REAR DIFF OUTDRIVE ADAPTER - V2 - HUDY SPRING STEEL™ (2)
355084 F/R DIFF PIN (2)
355091 F/R DIFF GASKET (4)
903312 HEX SCREW SFH M3x12 (10)
940816 HIGH-SPEED BALL-BEARING 8x16x5 BLUE COVERED (2)
964030 WASHER S 3.5x12x0.2 (10)
964060 WASHER S 6x18x0.2 (10)
971061 SILICONE O-RING 6x1.55 (10)
980261 PIN 2.5x11.5 (10)
BAGS
940816
903312
355046
964060
355031
355031
971061 355022
940816
355091
964030
980261
971061 355084
355064
FRONT
REAR
FRONT
355064
FRONT
355065
REAR
355065
REAR
940816
BB 8x16x5
964060
S 6x18x0.2
971061
O 6x1.55
980261
P 2.5x11.5
Graphite Grease
(HUDY #106210)
Graphite Grease
(HUDY #106210)
Graphite Grease
(HUDY #106210)
➏
#355003
XB8 FRONT/REAR DIFFERENTIAL 46T - V1 - SET
• High-performance adjustable front Active Differential™ for improved speed & handling
• Fully adjustable on- and off-power performance using different internal segments and gears
• Improved diff action and traction
• Easy and consistent steering
#355105
ACTIVE FRONT DIFF
DETAIL
BOOK
SET-UP
Use HUDY Ball-Bearing Grease
#106220 - STANDARD
#106221 - BLUE
#106222 - RED
IMPORTANT!
Use the same diff outdrives on both ends of a diff.
#355022-G
DIFFERENTIAL CASE - V2 - GRAPHITE

7
DIFFERENTIAL OIL
After assembly the differentials should
have a length of 32.3~32.5 mm
measured from the ends of the installed
ball-bearings. If differentials are
longer, retighten the 4 screws holding
the crown gears.
32.3~32.5 mm
1. FRONT & REAR DIFFERENTIALS
964030
S 3.5x12x0.2
903312
SFH M3x12
2x
➊
➋
➌
➍
➎
➏
➊
➋
➌
➍
940816
BB 8x16x5
964060
S 6x18x0.2
971061
O 6x1.55
980261
P 2.5x11.5
Rear diff:
Silicone oil 3 000cSt
Fill just above the
satellite gears.
Rear diff 3 000cSt
Front diff 5 000cSt
Front diff:
Silicone oil 5 000cSt
Fill just above the
satellite gears.
Graphite Grease
(HUDY #106210)
Graphite Grease
(HUDY #106210)
Graphite Grease
(HUDY #106210)
F=R
REAR
FRONT
Tighten the screws equally Finish tightening in this order
➎
STEP DETAIL
DETAIL
BOOK
SET-UP
Use HUDY Ball-Bearing Grease
#106220 - STANDARD
#106221 - BLUE
#106222 - RED
IMPORTANT!
Use the same diff outdrives on both ends of a diff.
OILOIL
Fill the differentials
with oil just above the
satellite gears.
IMPORTANT!
VERY IMPORTANT!
OIL
INCORRECT
CORRECT
Do not overfill the differential.
If there is too much oil in the
differential, it may leak after
it cools down after use.
Use the following silicone oils included in the kit for initial settings:
FRONT diff: 5 000cSt / REAR diff: 3 000cSt
#107865 HUDY Ultimate Digital Pocket Scale 300g±0.01g
To ensure you have the same amount of oil from rebuild to rebuild, do the following:
1. Put the diff (without oil) on the scale and check the weight:
- REAR DIFF approx. 39.30g
- FRONT DIFF approx. 40.10g
2. Slowly pour oil into the diff and watch the weight.
Add 2.70g of oil into the diff. The approximate
weight of the diff+oil is REAR DIFF approx. 42.00g
and FRONT DIFF approx. 42.80g
FRONT FRONT
REAR gg
g
g
REAR
39.30g + 2.70g = 42.00g
40.10g + 2.70g = 42.80g
OIL
FRONT DIFF
REAR DIFF
39.30
40.10 42.00
42.80

8
355072
940816
903312
355056
971061
355031
355031
355031
964030
971061 355023
940816
355092
964060
964060
964030
355031
980261
355082
355072
• High-performance adjustable center Active Differential™ for improved speed & handling
• Fully adjustable on- and off-power performance using different internal segments and gears
• Increased forward traction and stability
• Easy and consistent steering
#355106
ACTIVE CENTER DIFF
1. CENTER DIFFERENTIAL
BAG
355013 CENTER DIFFERENTIAL - LARGE - SET
355023 CENTER DIFFERENTIAL CASE - V2
355031 STEEL DIFF BEVEL & SATELLITE GEARS - V2 (2+4)
355056 CENTER DIFF SPUR GEAR 46T - LARGE
355072 LARGE CENTER DIFF OUTDRIVE ADAPTER - HUDY STEEL (2)
355082 CENTER DIFF PIN (2)
355092 CENTER DIFF GASKET (2)
903312 HEX SCREW SFH M3x12 (10)
940816 HIGH-SPEED BALL-BEARING 8x16x5 BLUE COVERED (2)
964030 WASHER S 3.5x12x0.2 (10)
964060 WASHER S 6x18x0.2 (10)
971061 SILICONE O-RING 6x1.55 (10)
980261 PIN 2.5x11.5 (10)
940816
BB 8x16x5
971061
O 6x1.55
964060
S 6x18x0.2
➊
➋
➌
➍
➎
➏
Graphite Grease
(HUDY #106210)
Graphite Grease
(HUDY #106210)
Use HUDY Ball-Bearing Grease
#106220 - STANDARD
#106221 - BLUE
#106222 - RED
980261
P 2.5x11.5
STEP DETAIL
➎
➏
➏➎
DETAIL
CENTER DIFF SPUR GEAR - LARGE
#355056 46T INCLUDED
#355057 47T OPTION
#355058 48T OPTION
#355023-G
CENTER DIFFERENTIAL CASE - V2 - GRAPHITE
#355083
CENTER DIFF. PIN WITH INSERTS (2+4)
#355012
CENTER DIFFERENTIAL - V1 - SET
CENTER DIFF SPUR GEAR - LARGE
#355056 46T INCLUDED
#355057 47T OPTION
#355058 48T OPTION

9
DIFFERENTIAL OIL
➎
971061
O 6x1.55
964060
S 6x18x0.2
940816
BB 8x16x5
➊
➋
➍
➎
➏
➌
Graphite Grease
(HUDY #106210)
Graphite Grease
(HUDY #106210)
Use HUDY Ball-Bearing Grease
#106220 - STANDARD
#106221 - BLUE
#106222 - RED
32.3~32.5 mm
After assembly the differential
should have a length of 32.3~32.5
mm measured from the ends of
the installed ball-bearings. If
differential is longer, retighten the
4 screws holding the spur gear.
1. CENTER DIFFERENTIAL
964030
S 3.5x12x0.2
903312
SFH M3x12
Tighten the screws equally Finish tightening in this order
➊
➋
➌
➍
STEP DETAIL
Use the following silicone oil included in the kit for initial setting:
Center diff: 7 000cSt
DETAIL
BOOK
SET-UP
OIL
Fill the differentials
with oil just above the
satellite gears.
IMPORTANT!
VERY IMPORTANT!
OIL
INCORRECT
CORRECT
Do not overfill the differential.
If there is too much oil in the
differential, it may leak after
it cools down after use.
Center diff:
Silicone oil 7 000cSt
Fill to just above the satellite gears.
980261
P 2.5x11.5
#107865 HUDY Ultimate Digital Pocket Scale 300g±0.01g
1. Put the diff (without oil) on the scale and
check the weight (approximately 42.97g).
2. Slowly pour oil into the diff and watch the
weight. Add 5.33g of oil into the diff. The
approximate weight of the diff+oil is 48.30g.
To ensure you have the same amount of oil from rebuild to rebuild, do the following:
OIL
42.97g + 5.33g = 48.30g
CENTER DIFF
Center diff 7 000cSt
g
48.30
g
42.97

10
2. FRONT TRANSMISSION
940816
BB 8x16x5
980314
P 3x14
901404
SB M4x4
Graphite Grease
(HUDY #106210)
Apply oil from inside
to prevent breakage
of the rubber boot.
SHORT CVD DRIVE SHAFT
BEFORE inserting the clip on the central CVD shaft joint, apply a small
amount of threadlock on the area where the clip goes.
AFTER inserting the clip on the central CVD shaft joint, turn the clip so that
the slot is 90°from the pin. This will prevent the pin from opening the clip.
PIN
DETAIL
Cut on both front
and rear bulkhead blocks
DETAIL
➊
➊
➋
➋
➌
➌
➍
➍
STEP DETAIL
➍
STEP DETAIL
➎
355004
FRONT DIFF
908312
352006 XB8’16 DIFF BULKHEAD BLOCK SET FRONT/REAR
355004 XB8 FRONT DIFFERENTIAL 46T - V2 - SET
355114 BEVEL DRIVE GEAR 14T
355236 CVD DRIVE SHAFT COUPLING - HUDY SPRING STEEL™
355416 CENTRAL CVD SHAFT UNIVERSAL JOINT - HUDY SPRING STEEL™
355427 FRONT CENTRAL CVD DRIVE SHAFT - HUDY SPRING STEEL™
355471 DRIVE SHAFT LOCKING RING (2)
355472 DRIVE SHAFT BOOT (2)
901404 HEX SCREW SB M4x4 (10)
908312 HEX SCREW SOCKET HEAD CAP SCH M3x12 (10)
940816 HIGH-SPEED BALL-BEARING 8x16x5 RUBBER SEALED (2)
980314 PIN 3x14 (10)
BAG
➎
➎
➎
SHORT
FRONT DIFF 5 000 cSt
Graphite Grease
(HUDY #106210)
Push joint against gear to remove gap.
Tighten setscrew onto gear flat spot.
The ring can be assembled by hand,
but for easy disassembly we recommend
using snap ring pliers (HUDY #189040)
355472
355471
355427
355236
355416 352006
355114
352006
980314
901404
940816
940816
step 1step 2
step 3
OIL
DETAIL
#355426
FRONT UNIVERSAL CENTRAL DRIVE SHAFT - HUDY SPRING STEEL™ - SET
Follow the TECH TIP on page 5
for drive shaft pin servicing
Use HUDY Ball-Bearing Grease
#106220 - STANDARD
#106221 - BLUE
#106222 - RED
NOTE
ORIENTATION
908312
SCH M3x12

11
2. REAR TRANSMISSION
940816
BB 8x16x5
980314
P 3x14
901404
SB M4x4
Apply oil from inside to prevent
breakage of the rubber boot.
Graphite Grease
(HUDY #106210)
NOTE
ORIENTATION
LONG CVD DRIVE SHAFT
Cut on both front and
rear bulkhead blocks
BEFORE inserting the clip on the central CVD shaft joint, apply a small amount of
threadlock on the area where the clip goes.
AFTER inserting the clip on the central CVD shaft joint, turn the clip so that the slot is
90°from the pin. This will prevent the pin from opening the clip.
Follow the TECH TIP on page 5
for drive shaft pin servicing.
DETAIL
DETAIL
DETAIL
BAG
➊
➊
➋
➋
➌
➌
➍
➍
STEP DETAIL
➎
355005
REAR DIFF
908312
352006 XB8’16 DIFF BULKHEAD BLOCK SET FRONT/REAR
355005 XB8 REAR DIFFERENTIAL 46T - V2 - SET
353053 XB8 ALU REAR SHOCK TOWER - CNC MACHINED 7075 T6 (4MM)
355114 BEVEL DRIVE GEAR 14T
355236 CVD DRIVE SHAFT COUPLING - HUDY SPRING STEEL™
355416 CENTRAL CVD SHAFT UNIVERSAL JOINT - HUDY SPRING STEEL™
355625 REAR CENTRAL CVD DRIVE SHAFT - HUDY SPRING STEEL™
➎
➎
➎
LONG
Graphite Grease
(HUDY #106210)
REAR DIFF
3000cSt
The ring can be assembled by hand,
but for easy disassembly we recommend
using snap ring pliers (HUDY #189040)
Push joint against gear to remove gap.
Tighten setscrew onto gear flat spot.
908312
355472
355471
355625
355236
355416 352006
355114
352006
353053
980314
901404
940816
940816
PIN
STEP DETAIL
➍
step 1step 2
step 3
OIL
355471 DRIVE SHAFT LOCKING RING (2)
355472 DRIVE SHAFT BOOT (2)
901404 HEX SCREW SB M4x4 (10)
908312 HEX SCREW SOCKET HEAD CAP SCH M3x12 (10)
940816 HIGH-SPEED BALL-BEARING 8x16x5 RUBBER SEALED (2)
980314 PIN 3x14 (10)
#355626
REAR UNIVERSAL CENTRAL DRIVE SHAFT - HUDY SPRING STEEL™ - SET
step 4
Use HUDY Ball-Bearing Grease
#106220 - STANDARD
#106221 - BLUE
#106222 - RED
908312
SCH M3x12

12
BAG
3. REAR SUSPENSION
909395
353426
353327
352314
353371
353371
352006
909372
353316
352314
357212
902318
353116
903308
901305
901303
333450
352470
901312
352470
353116
352460
333450 ANTI-ROLL BAR BALL JOINT 5.8 MM (2)
352006 XB8’16 DIFF BULKHEAD BLOCK SET FRONT/REAR
352314 COMPOSITE ECCENTRIC BUSHINGS - V2 (2)
352460 PIVOT BALL 5.8 (10)
352470 BALL JOINT 5.8 (8)
353116 COMPOSITE REAR LOWER SUSPENSION ARM - HARD
353316 ALU REAR LOWER SUSP. HOLDER - FRONT - SQUARE ADJ. ROLL CENTER
353327 ALU REAR LOWER SUSP. HOLDER - REAR - SQUARE ADJ. ROLL CENTER
353371 SET OF COMPOSITE LOWER ARM SHIMS
353426 REAR ANTI-ROLL BAR 2.6MM
357212 LOWER INNER PIVOT PIN F+R (2)
901408
901303 HEX SCREW SB M3x3 (10)
901305 HEX SCREW SB M3x5 (10)
901312 HEX SCREW SB M3x12 (10)
901408 HEX SCREW SB M4x8 (10)
902318 HEX SCREW SH M3x18 (10)
903308 HEX SCREW SFH M3x8 (10))
909372 SCREW PHILLIPS SS 3.5x22 (10)
909395 SCREW PHILLIPS SS 3.5x45 (10)
REAR ANTI-ROLL BARS
#353418 ø1.8mm OPTION
#353420 ø2.0mm OPTION
#353422 ø2.2mm OPTION
#353424 ø2.4mm OPTION
#353425 ø2.5mm OPTION
#353426 ø2.6mm INCLUDED
#353428 ø2.8mm OPTION
#353430 ø3.0mm OPTION
#353113 XB8’16 COMPOSITE REAR LOWER SUSPENSION ARM - RIGHT
#353123 XB8’16 COMPOSITE REAR LOWER SUSPENSION ARM - LEFT
#353317 XB8 ALU REAR LOWER SUSP. HOLDER - FRONT - SQUARE ADJ. ROLL CENTER
#353325 XB8 ALU REAR LOWER SUSP. HOLDER - REAR - SQUARE ADJ. ROLL CENTER
#333451
ALU ANTI-ROLL BAR PIVOT BALL 5.8 MM - SWISS 7075 T6 - HARDCOATED (2)
#902407
HEX SCREW SH M4x7 WITH HEX FROM BOTTOM (4)
REAR SUSPENSION ARM
#353115 MEDIUM OPTION
#353116 HARD INCLUDED
#353116-G GRAPHITE OPTION

13
TOE-IN
ANTI-SQUAT
ROLL CENTER DOWNSTOP
WHEELBASE
TRACK WIDTH
909395
SS 3.5x45
909372
SS 3.5x22
901408
SB M4x8
353371
SHIM 4x10x2
MEDIUM SUSPENSION ARMS HARD SUSPENSION ARMS GRAPHITE SUSPENSION ARMS
(HUDY #107634)
ARM REAMER
If the suspension arm does not move
freely use a HUDY Arm Reamer to
resize the holes of the arms.
➊
➊
➋
➌
➌
➍
➍
➎
4mm
4x8mm
RR
RF
All possible mounting
alternatives of eccentric bushings
INITIAL SETTING
RF
0.5°
1°
INITIAL SETTING
RR
0.5°
1°
Check for free movement
DETAIL
DETAIL
ECCENTRIC BUSHINGS HAVE TWO DIFFERENT OFFSETS FROM THE CENTER.
Middle position = 0.5 mm or 0.5° from center Outer position = 1mm or 1° from center
The XRAY rear alu lower suspension holders provide even greater range of adjustment for the rear suspension. Using different combinations of eccentric bushings, fine adjustment of rear anti-squat, rear
toe-in, rear roll center, and rear track-width can be obtained. For more information about the influence of rear anti-squat, rear toe-in, rear roll center and rear track width on car handling, please refer to
HUDY Off-Road Set-up Book (#209099).
The tables describe the amounts of rear anti-squat, rear toe-in, rear track-width change depending
on the combinations of eccentric bushings used with 0 and 1mm, 1° offset. The 0.5mm, 0.5° represents
the half change.
Anti-Squat Example:
0(RR) - 0 (RF) = 3°
0(RR) - 0.5 (RF) = 3.5°
0(RR) - 1 (RF) = 4°
ANTI-SQUAT ROLL CENTER TRACK-WIDTH TOE-IN
RR RR RR RRRF RF RF RF(°) (mm) (mm) (°)
=3°
=4°
=2°
=4°
=3°
=5°
=2°
=3°
=1°
= 3°
= 3.5°
= 4°
=0mm
=1mm
=-1mm
=308
=306
=310
=3°
=4°
=2°
=2°
=3°
=1°
=4°
=5°
=3°
3.5x45mm
3.5x22mm
BOOK
SET-UP
RF
0.5°
1°
RR
0.5°
1°
RF
0.5°
1°
RR
0.5°
1°
RF
0.5°
1°
RR
0.5°
1°
Do not use INNER positions. All positions are available.All positions are available.
2.0mm
DOWNSTOP SETTING
DETAIL
2.0mm Allen
#902407
Downstop screw
for fine tuning.
NOTE
ORIENTATION
NOTE
ORIENTATION
REAR SUSPENSION ARM
#353115 MEDIUM OPTION
#353116 HARD INCLUDED
#353116-G GRAPHITE OPTION
3. REAR SUSPENSION

14
3. REAR SUSPENSION
ANTI-ROLL BAR
901303
SB M3x3
901305
SB M3x5
901312
SB M3x12
902318
SH M3x18
903308
SFH M3x8
1.5mm
6mm
DETAIL
2.5~3.0mm
L=R
STEP DETAIL
➍
DETAIL
Loosen the 3x5 setscrew if the
anti-roll bar does not turn freely
Step
➊
DETAIL
Step check for free movement
➊
DETAIL
INITIAL SETTING
DETAIL
L=R
2x
➋
➊
➌
3x5mm
3x8mm
3x3mm
3x18mm
BOOK
SET-UP
Install the pivot balls with Professional
Multi Tool (HUDY #183011)
REAR ANTI-ROLL BARS
#353418 ø1.8mm OPTION
#353420 ø2.0mm OPTION
#353422 ø2.2mm OPTION
#353424 ø2.4mm OPTION
#353425 ø2.5mm OPTION
#353426 ø2.6mm INCLUDED
#353428 ø2.8mm OPTION
#353430 ø3.0mm OPTION

15
980317
P 3x17
901504
SB M5x4
940814
BB 8x14x4
941318
BB 13x19x4
980263
P 2.5x13
➊
➋
➌
➏
➐
➑
➍
➎
8x14x4mm
3x17mm
2.5x13mm
13x19x4mm
Follow the TECH TIP on page
5 for drive shaft pin servicing
To tighten the setscrew you can also use the
HUDY 17mm Wheel Nut Tool #107570
2.5mm
DETAIL
4. REAR SUSPENSION
352634 ADJ. TURNBUCKLE M5 L/R 50 MM - HUDY SPRING STEEL™ (2)
353020 COMPOSITE REAR BRACE HOLDER
353130 REAR UPPER INNER CAMBER LINK BALL JOINT (2)
353151 RELIEF REAR UPPER OUTER CAMBER LINK BALL JOINT (2)
353160 MOUNTING BALL 6.8 (4)
353170 PIVOT BALL 6.8 (4)
353353 COMPOSITE REAR UPRIGHT
353370 SET OF COMPOSITE REAR HUB CARRIER SHIMS
353524 XB8'18 COMPOSITE REAR WING HOLDER
355211 CVD DRIVE AXLE - HUDY SPRING STEEL™
355221 CVD UNIVERSAL DRIVE SHAFT - HUDY SPRING STEEL™
355237 CVD DRIVE SHAFT COUPLING - HUDY SPRING STEEL™
355250 ALU WHEEL AXLE - BLACK COATED (2)
BAG
2x
L=R
357331 XB808 REAR LOWER OUTER PIVOT PIN SCREW 3MM (2)
901504 HEX SCREW SB M5x4 (10)
902314 HEX SCREW SH M3x14 (10)
902318 HEX SCREW SH M3x18 (10)
902330 HEX SCREW SH M3x30 (10)
903312 HEX SCREW SFH M3x12 (10)
908318 HEX SCREW SOCKET HEAD CAP SCH M3x18 (10)
940814 HIGH-SPEED BALL-BEARING 8x14x4 BLUE COVERED (2)
941318 HIGH-SPEED BALL-BEARING 13x19x4 BLUE COVERED (2)
960030 NUT M3 (10)
980263 PIN 2.5x13 (10)
980317 PIN 3x17 (10)
908318
353524
960030
353170
902330
353353
353151
902318
352634
353160
353020
903312
960030
353130
355221
355237
980263
355211
980317
901504
940814
941318
357331
902314
960030
960030 353353
355250
353370
OFFSET WHEEL AXLES
#355250 0mm INCLUDED
#355251 +1mm OPTION
#355252 +2mm OPTION
OFFSET WHEEL AXLES
#355250 0mm INCLUDED
#355251 +1mm OPTION
#355252 +2mm OPTION
NOTE ORIENTATION
Use HUDY Ball-Bearing Grease
#106220 - STANDARD
#106221 - BLUE
#106222 - RED
Graphite Grease
(HUDY #106210)

16
4. REAR SUSPENSION
CAMBER
353370
SHIM 3x9x1
353353
SHIM 3x9x7
353370
SHIM 3x9x2
960030
N M3
902318
SH M3x18
902330
SH M3x30
960030
N M3
Ensure that the rear upright moves freely.
If it does not move freely, use sandpaper
to thin both wheelbase adjustment shims.
Shims for wheelbase
adjustment
2mm
Do not overtighten the self-locking nut.
Overtightening may result in suspension binding.
If the rear upright does not move freely, use a HUDY Arm Reamer to resize the hole.
ARM REAMER
1+1mm INITIAL SETTING
(HUDY #107633)
2x
L=R
Check for free
movement
DETAIL
DETAIL
2x
2x
L=R
L=R
RIGHT
THREAD
LEFT
THREAD
OIL
OIL
RIGHT THREAD RIGHT THREADLEFT THREAD LEFT THREAD
26.5mm
7mm
26.5mm
NOTE ORIENTATION
NOTE
ORIENTATION
INITIAL SETTING
DETAIL
DETAIL
INITIAL SETTING
L=R
NOTE
ORIENTATION
3x18mm
3x30mm
BOOK
SET-UP
DETAIL
Use tools to tighten as shown
Special Tool for all turnbuckles & nuts (HUDY #181090)
or Turnbuckle Wrench 5mm (HUDY #181050)
Install the pivot balls with Professional
Multi Tool (HUDY #183011)

17
4. REAR SUSPENSION
960030
N M3
903312
SFH M3x12
902314
SH M3x14
908318
SCH M3x18

18
909372
901408
902318
352120
909395
901303
901312
901305
903308
352324
352314
357212
352314
353371
333450
352470
352494
352470
352460
352006
352323
FRONT ANTI-ROLL BARS
#352487 1.6mm OPTION
#352489 1.8mm OPTION
#352490 2.0mm OPTION
#352492 2.2mm OPTION
#352493 2.3mm OPTION
#352494 2.4mm INCLUDED
#352495 2.5mm OPTION
#352496 2.6mm OPTION
5. FRONT SUSPENSION
333450 ANTI-ROLL BAR BALL JOINT 5.8 MM (2)
352006 XB8’16 DIFF BULKHEAD BLOCK SET FRONT/REAR
352120 XB8 COMPOSITE FRONT LOWER SUSPENSION ARM
352323 ALU FRONT LOWER SUSP. HOLDER - FRONT - SQUARE ADJ. ROLL CENTER - V2
352324 ALU FRONT LOWER SUSP. HOLDER - REAR - SQUARE ADJ. ROLL CENTER - V2
352314 COMPOSITE SQUARE ADJ. ROLL CENTER BUSHINGS - V2 (2)
352460 PIVOT BALL 5.8 (10)
352470 BALL JOINT 5.8 (8)
352494 FRONT ANTI-ROLL BAR 2.4MM
353371 SET OF COMPOSITE LOWER ARM SHIMS
357212 LOWER INNER PIVOT PIN F+R (2)
901303 HEX SCREW SB M3x3 (10)
901305 HEX SCREW SB M3x5 (10)
901312 HEX SCREW SB M3x12 (10)
901408 HEX SCREW SB M4x8 (10)
902318 HEX SCREW SH M3x18 (10)
903308 HEX SCREW SFH M3x8 (10))
909372 SCREW PHILLIPS SS 3.5x22 (10)
909395 SCREW PHILLIPS SS 3.5x45 (10)
BAG
#333451
ALU ANTI-ROLL BAR PIVOT BALL 5.8 MM - SWISS 7075 T6 - HARDCOATED (2)
#902407
HEX SCREW SH M4x7 WITH HEX FROM BOTTOM (4)

19
5. FRONT SUSPENSION
KICK UP
ROLL CENTER DOWNSTOP
WHEELBASE
TRACK WIDTH
901408
SB M4x8
909395
SS 3.5x45
909372
SS 3.5x22
353371
SHIM 4x10x2
All possible mounting alternatives
of eccentric bushings
3.5x22mm
3.5x45mm
The tables below describe the amounts of kick-up, front track-width change depending on the combinations
of eccentric bushings used with 0 and 1mm, 1° offset. The 0.5mm, 0.5° represents the half change.
* Not recommended to use this setting.
NOT RECOMMENDED TO USE THIS SETTING
TRACK-WIDTH ROLL CENTER
FF FFFR FR(mm) (mm)
=308
=306
=310*
=1
=0
=-1
The XRAY alu front lower suspension holders provide even greater range of
adjustment for the front suspension. Using different combinations of eccentric
bushings, fine adjustment of front kick-up, roll center, and front track-width
can be obtained. For more information about the influence of kick-up, front
track-width, and roll centers on car handling, please refer to HUDY Off-Road
Set-up Book (#209099).
Eccentric bushings have two different offsets from the center.
Middle position = 0.5 mm or 0.5° from center
Outer position = 1mm or 1° from center
➊
➊
➋
➌
➌
➍
➍
➎
4x8mm
FR
FF
2mm
2mm
4mm
4mm
2mm
2mm
2mm
2mm
4mm
4mm
DETAIL
FRONT ARM
L=R
DETAIL
Check for free movement
DETAIL
Push the arm from both sides to create play
INITIAL SETTING
FF
0.5°
1°
INITIAL SETTING
FR
0.5°
1°
(HUDY #107634)
ARM REAMER
If the suspension arms do not move freely,
use a HUDY Arm Reamer to resize the holes.
DETAIL
0.0mm
DOWNSTOP SETTING
DETAIL
2.0mm Allen
#902407
Downstop screw
for fine tuning.
INITIAL SETTING ALTERNATIVE SETTING
INITIAL SETTING
BOOK
SET-UP

20
5. FRONT SUSPENSION
ANTI-ROLL BAR
901303
SB M3x3
901305
SB M3x5
901312
SB M3x12
902318
SH M3x18
903308
SFH M3x8
FRONT ANTI-ROLL BARS
#352487 1.6mm OPTION
#352489 1.8mm OPTION
#352490 2.0mm OPTION
#352492 2.2mm OPTION
#352493 2.3mm OPTION
#352494 2.4mm INCLUDED
#352495 2.5mm OPTION
#352496 2.6mm OPTION
3x3mm
3x5mm
3x8mm
-2~0mm
3x18mm
L=R
2x
Step check for free movement
➊
Loosen the 3x5 setscrew if
the anti-roll bar does not
turn freely
Step
➊
➊
➋
➌
➍
L=R
STEP DETAIL
➍
1.5mm
6mm
DETAIL
DETAIL
DETAIL
BOOK
SET-UP
Install the pivot balls with Professional
Multi Tool (HUDY #183011)