Weaver MASTER TOOL CUB User manual

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MASTER TOOL CUB SEWING MACHINE
OWNER’S MANUAL
U.S. Patent #9,657,418
INSERT-192 6/22
22-4959-SP-PKG

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Hand-Crank Design Simulates a
Flywheel for Natural Movement
and Precision Stitching
Congratulations on your purchase of the Master Tool Cub Sewing Machine. This
heavy-duty cylinder arm sewing machine stitches up to 3/4" leather, nylon and
canvas with ease and precision with a non-motorized, portable design that’s
perfect for crafters, hobbyists and repair shops.
• Patented, hand-crank design simulates a flywheel, encouraging natural
movement for smooth operation that makes it easy to maintain a continuous
line of stitching.
• Sews up to 4 stitches per inch with a consistent stitch length no matter
the speed.
• Portable design is great for taking to shows.
• Backed by our Limited Lifetime Guarantee.
Table of Contents
Page
Unpack Your Box...................................................3
Attaching the Hand-Crank Flywheel ................................4
Moving the Flywheel Handle........................................5
Getting to Know the Master Tool Cub Sewing Machine ...............6
Threading .....................................................7 & 8
Filling Bobbins .....................................................8
Removing and Inserting Bobbin.....................................9
Stitching .....................................................10 & 11
Adjusting Thread Tension .........................................12
Adjusting Bobbin Tension .........................................12
Changing the Needle..............................................13
Needle & Thread Chart ............................................13
Maintenance ................................................ 14 & 15
Troubleshooting ..................................................15
Replacement Parts................................................16
HANDCRAFTED IN THE USA
LIMITED LIFETIME GUARANTEE

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UNPACK YOUR BOX
The Master Tool Cub arrives
completely assembled.
You’ll find the following in your box:
1. Master Tool Cub Sewing Machine
2. Thread Holder
3. Two 4 oz. Spools of White Thread
4. Thread Nipper
5. Bobbin Winder
6. Two Bobbins
7. One Pack of 794S-200 Needles
8. Allen Wrenches
9. 4 oz. Lily Stitching Oil
10. Sewing Machine Oiler
11. Roller Guide
12. Mounting Hardware
13. Owner’s Manual
Machine holds Allen
Wrenches and Bobbin
Winder for easy access
Shipping Weight:
50 lbs.
weaverleathersupply.com
800-932-8371
1
MASTER TOOL CUB SEWING MACHINE
OWNER’S MANUAL
U.S. Patent #9,657,418
INSERT-192 6/22
22-4959-SP-PKG
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You may find it easier to transport the Master Tool Cub without the Flywheel
attached. The Flywheel can be easily removed after loosening the Bolts with a
3/16" Allen Wrench. Below are instructions on attaching the Flywheel.
1) Locate the flat sides on the Flywheel Shaft. (Figure 1)
2) Slide the Hand-Crank Flywheel on the Flywheel Shaft, making sure to
line up the Bolts with the flat sides on the Flywheel Shaft. (Figure 2)
3) Tighten the Bolts using the included 3/16" Allen Wrench. (Figure 3)
ATTACHING THE HAND-CRANK FLYWHEEL
Figure 2 Figure 3Figure 1
Hand-CrankHand-Crank
FlywheelFlywheel
FlywheelFlywheel
ShaftShaft
BoltsBolts

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MOVING THE FLYWHEEL HANDLE
Figure 4 Figure 5
Important Note: Flywheel design features two threaded holes for changing the position of
the Flywheel Handle. (Figure 4)
The threaded screw inside the Handle can be reached from the cut out portion on the
Handle’s end and loosened using the included 7/32" Allen Wrench. Move the Handle to the
desired threaded hole, and tighten the screw using the Allen Wrench. Make sure the Handle
is attached securely. (Figure 5)
Positioning the Handle on the outer edge of the wheel provides more leverage and control.
Moving the Handle to the inner position allows the Flywheel to turn faster.

GETTING TO KNOW THE MASTER TOOL CUB SEWING MACHINE
Do not operate this machine until you have read and understand the instructions in this manual.
This machine is designed for stitching up to 3/4" leather, nylon and canvas. Use for any other
purpose is prohibited and voids the warranty.
Hand-Crank
Flywheel
Safety
• Never use this machine unless it is securely fastened to a workbench. Simply
secure machine to your workbench with included mounting hardware.
• Always keep all fingers and body parts away from moving parts.
• Keep in mind that this machine weighs 50 lbs. Always use proper lifting
techniques when moving it and verify its stability before use.
• Keep away from children at all times.
TensionerTensioner
Jump FootJump Foot
AdjustmentAdjustment
TopTop
ThreadThread
EyeletEyelet
ThreadThread
StandStand
ThreadThread
GuideGuide
FootFoot
LiftLift
LeverLever NeedleNeedle
FootFoot
ShuttleShuttle
TensionTension
BarBar
Take-UpTake-Up
ArmArm
NeedleNeedle
BarBar
StitchStitch
Length DialLength Dial
Limited Lifetime Guarantee
Every Master Tool is built to last using the finest materials and skilled American workmanship. We are proud to stand behind our products with an
unmatched Limited Lifetime Guarantee. This quality standard warrants each product for its lifetime against defects in materials and workmanship
under correct use, normal operating conditions and proper application. This guarantee does not extend to any component parts not manufactured
by Weaver Leather, or if the machine is modified in any way. Weaver Leather makes no express warranties other than those that are specifically
described herein. This warranty is expressly in lieu of all other warranties express or implied. There are no implied warranties of any kind including
merchantability or fitness for a particular purpose. Weaver Leather will in no event be liable for any incidental or consequential damages whatsoever,
nor for any sum in excess of the price received for the goods.
ThreadThread
CutterCutter
Foot PressureFoot Pressure
AdjustmentAdjustment
KnobKnob
6

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THREADING
BB
CC
BBCC
DD
GG
II
EE
HH
JJ
KK
FF
Figure 6 Figure 7 Figure 8
DD
EE
FF
GG
1) Run thread from Spool (A) on Thread Stand (B) to the Thread Eyelet (C). (Figure 6)
2) Run thread through Tensioner Eyelet 1 (D), around the Tensioner and through Tensioner
Eyelet 2 (E). Make sure thread is pulled tightly in between the Tensioner Discs (F).
(Figure 7)
3) Run thread down the front of the machine to the Thread Guide (G), threading it from right
to left. (Figure 8)
AA
Threading continued on page 8.

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FILLING BOBBINS
Figure 13 Figure 14 Figure 15
A Bobbin Winder is included that may be attached to an electric drill to assist you in winding
bobbins if desired. We accept no liability for any injury or damage incurred through the
use of this method.
TO USE THE BOBBIN WINDER
1. Bring the thread from the spool through the hole in the end of the Bobbin. (Figure 13)
2. Bring the thread through the split end of the Bobbin Winder, then place the Bobbin on the
Bobbin Winder. (Figure 14)
3. With a light tension on the thread, turn the drill over slowly and allow the Bobbin to wind
evenly. (Figure 15)
4) Run thread back up the front of the machine and through the Take-Up Arm (H).
Make sure thread is run in front of the Tension Bar (I) at this point. (Figure 9)
5) Run thread back down and behind the Tension Bar (I). (Figure 10)
6) Run thread through the bottom of the Needle Bar (J) and through the Needle
Eye towards the machine (K). (Figures 11 & 12)
THREADING CONT.
HH
II
JJ
KK
Figure 9 Figure 11Figure 10 Figure 12

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REMOVING BOBBIN
1) Turn machine over until Bobbin Case sets in position shown. (Figure 16)
2) Pull back tab (A) to release Bobbin Case.
3) Lift base of Bobbin Case out to remove Bobbin. (Figure 17)
Important Note: When closing Bobbin Case, make sure the Case snaps back
into place with the tab holding it.
INSERTING BOBBIN
1) Place a full Bobbin into empty Bobbin Case, and slip the thread from the Bobbin
into the slot (B) at the base of the Case. (Figures 18 & 19)
2) Continue pulling thread under the tension spring until it rests in the fork (C) of the spring.
(Figure 20)
Important Note: The Bobbin should always be inserted so thread unwinds counterclockwise
to ensure consistent tension. (Figure 21)
REMOVING & INSERTING BOBBIN
Figure 19
BB
Figure 20
CC
Figure 21
Figure 16 Figure 17 Figure 18
AA

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STITCHING
Please Note: This machine does not have reverse. You may choose to turn your work and
take a “forward stitch” for a “backstitch,” or tie the thread off manually. (Figure 22)
1) Begin by lifting the Presser Foot by raising the Foot Lift Lever located directly behind it.
(Figure 23)
2) Hold the upper thread and bobbin thread under the Presser Foot and to the rear. Insert
your work under the foot, positioning it so the needle is directly above the desired point
of entry for your first stitch. (Figure 24)
3) While still holding the thread to the rear, lower the foot and turn the crank to complete
your first couple stitches. After the stitches are made, you can release the thread.
(Figure 25)
Figure 22
Figure 24
Figure 23
Figure 25

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STITCHING
ADJUSTING STITCH LENGTH
TURNING YOUR WORK AT CORNERS
Figure 27
Figure 26
Figure 28
Locate the Stitch Length Dial on the front of the
machine. For a longer stitch length, turn the dial
counterclockwise. For a shorter stitch length,
turn the dial clockwise. (Figure 27)
Please note: Your work should be turned before your
needle exits the material. At this point, raise the Presser
Foot slightly, pivot your work to the new position,
and resume stitching. (Figure 28)
LongerLonger
StitchStitch
ShorterShorter
StitchStitch
IncreaseIncrease
PressurePressure
LessenLessen
PressurePressure
The amount of pressure the Presser Foot places
on your work is controlled by the Foot Pressure
Adjustment Knob (A). Turn the knob clockwise
to increase the pressure placed on your work, or
counterclockwise to lessen the pressure. (Figure 26)
ADJUSTING FOOT PRESSURE
AA

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Thread tension on the Master Tools Cub is
controlled primarily from the Upper Thread
Tension. As needed, turn the Tension Assembly
Nut (B) clockwise to tighten the tension or
counterclockwise to loosen the tension.
(Figure 29)
ADJUSTING THREAD TENSION
ADJUSTING BOBBIN TENSION
Figure 29
Figure 30
BB
Important Note: The bobbin tension rarely needs adjusted, even when using varying sizes
of thread. The rule of thumb is that the bobbin thread tension is always less than the upper
thread tension.
TO ADJUST TENSION (Figure 30)
1) Loosen Lock Screw (C). Failure to loosen lock screw may result in a broken screw or
damage to the bobbin case.
2) Turn Adjusting Screw (D) clockwise to tighten tension or counterclockwise to loosen tension.
3) Tighten Lock Screw (C) when proper tension has been established.
Correct
Needle and bobbin threads
are equally drawn into
material resulting in a
perfect stitch.
Wrong
When the knot is on top of
the material, the top tension
is likely too tight. Turn
Tension Assembly Nut (B)
counterclockwise to
loosen tension.
Wrong
When knot is on the bottom
of material, the top tension
is likely too loose. Turn
Tension Assembly Nut (B)
clockwise to tighten tension.
CC
DD
TightenTighten
TensionTension
LoosenLoosen
TensionTension

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CHANGING THE NEEDLE
Refer to the Thread & Needle Chart below to ensure you are using the correct needle
for the thread you are using.
1) Loosen the Needle Screw (A) with the Allen Wrench provided and remove the old needle.
(Figure 31)
2) Be sure the new needle is positioned correctly with the Scarf (B) facing to the right.
Please note: You should be able to see the needle in the two round openings of the
needle bar. (Figures 32 & 33)
Troubleshooting Tip: If you experience sewing difficulties, including skipped stitches,
failure to pick up the bobbin thread, and frayed thread, try changing your needle. Bent
or dull needles may be responsible.
Correct
Needle
Position
Wrong
Needle
Position
AA
BB
Figure 31
Figure 33
Figure 32
NEEDLE & THREAD CHART
The Master Tool Cub uses 794S (Chisel Point), 794LR (Twisted
Chisel Point) and 7X3R (Round Point) System Needles:
• Chisel Point & Twisted Chisel Point Needles –
Recommended for leather or non-wovens
• Round Point Needles – Recommended for woven materials
Helpful Tips
• When ordering needles indicate 794S or 794LR for leather
or 7X3R for nylon.
• We recommend using Schmetz®brand needles for superior
performance.
• Be sure to use the correct needle for the thread being used.
NEEDLE
SIZE
THREAD TOP/
BOTTOM
230 346/277
200 277/207
180 207/138
160 138/92

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MAINTENANCE
We recommend oiling the Master Tool Cub after every eight hours of use with Lily Stitching
Oil. Oiling Points are indicated on Figures 35, 36 and 37.
Figure 35 Figure 36
OILOIL
OILOIL
OILOIL
OILOIL
OILOIL
OILOIL
OILOIL
OILOIL
OILOIL
OILOIL
OILOIL
OILOIL

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Figure 37
OILOIL
OILOIL
OILOIL
TROUBLESHOOTING
ADJUSTING TIMING
If you think your machine’s timing is off, call Weaver Leather at 1-800-932-8371,
ext. 223 for assistance.
MAINTENANCE

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REPLACEMENT PARTS
1. 65-8228
Shuttle
2. 63500-124
Bobbin Winder
3. 65-8121
Bobbin
➌➌
4. 63500-125
Thread Stand
6. 88008-06
Needle Bar Set Screw
8-32 x 3/16"
5. 63500-102
Presser Foot
7. 88014-01
Shuttle
Cover Door
➊➊