Gamma+ 7500 Els User manual

OWNER'S MANUAL
Issue 3 - December 18, 2000
7500 Els
STRINGING MACHINE
Copyright 2000 GAMMA Sports - All Rights Reserved
Provided by www.gssalliance.com

TABLE OF CONTENTS
LIMITED WARRANTY
GAMMA SPORTS ("GAMMA") warrants to the original purchaser that the GAMMA stringing machine ("EQUIPMENT") purchased is free from defects in
materialsandworkmanshipforaperiodoffive(5)yearsfromthedateoforiginalpurchaseformechanicalparts(excludingelectronicpartsandstringclamps),
and for a period of one (1) year from the date of purchase for electronic parts and string clamps. Should any defects develop under normal use within the
specified time periods, GAMMA will at its option, repair or replace the defective EQUIPMENT provided it is returned to GAMMA prepaid at the purchaser's
expense. This warranty does not apply to any damage or defect caused by negligence, abuse, misuse, unauthorized alteration, shipping, handling, or part
wear and tear as a result of normal use.
GAMMA's obligation under this warranty is limited to repair or replacement of defective EQUIPMENT, and no one is authorized to promise any other liability.
GAMMA shall in no event be liable for any incidental or consequential damages.
ToreturndefectiveEQUIPMENT, a return authorization(RA#)mustbe obtained from aGAMMAcustomerservice representative by calling1-800-333-0337.
TheRA#mustbemarked on theoutsideoftheshippingcarton being returned.Allreturnsmustbeshipped prepaid by thecustomertoGAMMA. Please retain
the original shipping carton and packing materials for any future shipments.
7500 Els
Owner’s Manual
INSIDE FRONT COVER .....................................................................WARRANTY
PAGE 1................................................................................................. FEATURES
PAGE 2................................................................ CONTENTS AND UNPACKING
PAGE 3.....................................................................ASSEMBLY INSTRUCTIONS
PAGE 9.................................................... POWER CONNECTIONS & CONTROL
PAGE 10................................ CONTROL PANEL FUNCTIONS AND FEATURES
PAGE 11.................................................STRING LENGTH METER OPERATION
PAGE 12........................................................... CAM-LOCK CLAMP OPERATION
PAGE 13.................................... STRING GRIPPER / TENSIONER OPERATION
PAGE 14.........................................................................MOUNTING THE FRAME
PAGE 15........................................................................ STRINGING THE FRAME
PAGE 16............................................................PATHFINDER AWL OPERATION
PAGE 17................................................... MAINTENANCE AND ADJUSTMENTS
PAGE 18............................................................................ CARE AND CLEANING
PAGE 19....................................................................TROUBLE SHOOTING TIPS
PAGE 20..............................................................PART NUMBERS AND LISTING

7500 Els
Key Product Features
1. Electric Constant Pull String Tensioner w/ Diamond Coated String Gripper
(10-90 lbs tension range in 0.10 lbs increments)
2. Electronic Control Panel w/ Keypad, Knot, Prestretch, & String Length Functions
3. String Reel Holder
4. Electronic String Length Meter
5. 6 Point “Suspension” Mounting System (10 point support)
6. Dual Action, CAM-Lock, Swivel, String Clamps w/ Diamond Coating
7. Convenient Foot Actuated Tensioner Switch
8. Full Fiberglass Cover w/ Integrated Tool Trays (76 sq in of storage area)
9. Height Adjustable from 39” to 46” (can also be used on table top)
10. 110 V / 220 V Compatibility
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7500 Els
Unpacking Instructions & Contents
2
Instructions for Unpacking and Preparing for Assembly
The 7500 Els is shipped in two cartons, a large carton for the stringing machine and accessories and a smaller
carton for the post and base legs. Please save the cartons and packing materials for possible shipments in
the future. Gamma Sports cannot be responsible for machines that are not returned, shipped in their original,
undamaged packaging. The tools you will need to assemble the 7500 Els are provided with the machine. Due to
the weight of the tensioner unit, you may need the assistance of someone to help lift the tensioner unit out of the
carton.
Once the cartons are opened, remove all inner cartons and check to be sure that all parts are present and
accounted for.
Contents of Base & Leg Carton
(1) Lower Post
(2) Upper Post with Flange Plate
(4) Legs
(1) Locking Knob Screw
(4) M8 x 25 Flat Head Screws
(4) M8 x 30 Cap Screws
(1) String Reel Holder (M8 Threaded Pin), (1) Knob, (10) Spacers, & (2) M8 Washers
Contents of Large Master Carton (including accessory cartons packed inside)
(1) Stringer Assembly Unit w/ Tensioner Module and Turntable
(1) Power Cord w/ Ground Pin
(2) Suspension Mounting Stands w/ Frame Support Slide, Side Supports, and Adapters
(2) Mounting Stand Locking Levers w/ Washers
(2) String Clamp Heads
(2) Badminton Frame Support Slides Fitted w/ Plastic Adapter
(1) Package of Spare plastic adapters for mounting system supports (contains 12 pcs)
(1) Face Plate for String Length Meter & (4) Spare String Length Meter Clamp Pads
(4) Rubber Feet w/ Screws
(1) Foot Pedal Tensioner Switch
(1) Tool Kit (contains side cutter, bent nose pliers, needle nose pliers)
(1) Straight Stringers Awl & (1) Pathfinder Specialty Awl
(1) Starting Clamp
(2) Composite Badminton Floating Clamps
(1) 6 mm “T” Handle Hex Wrench
(1) 5 mm “T” Handle Hex Wrench
(1) 10 pc L-Hex Wrench Set
(2) Support Post Screws (M10)
(1) Box Wrench – 6 mm

3
Base Leg Assembly
The stringing machine uses a four leg base design. The
legs must be assembled to the support post before use.
Remove the lower column support, the upper column
support, four (4) legs, four (4) socket head cap screws
andfour(4)flatheadcapscrews fromthesmallshipping
carton.
Base Leg Assembly (Cont.)
Align the holes in the leg flange with the matching holes
inthelowercolumnsupportpost.Securethelegwithone
FLAT HEAD cap screw through the upper hole, and one
SOCKET HEAD cap screw through the bottom hole.
Assembly Instructions
Base Leg Assembly (Cont.)
Tocomplete the basestand,screw the heightadjustmentlocking knob
(“A”) into the side of the support column. The locking knob should not
protrude beyond the inside of the support column at this time.
“A”

4
Foot Installation
CAUTION ! To maintain the alignment between the
fiberglass covers and the frame, it is very important
that the feet be installed before removing the four
center screws that attach the tensioner assembly to
the upper post flange.
To install the feet, tilt the tensioner back on its side and
screw the four feet into the holes at the corners of the
base.
Stand Upper Post Installation
After installing the four corner feet, remove the four (4)
button head cap screws from the base of the assembly.
Assembly Instructions
Unpacking the Tensioner Assembly
The tensioner assembly is packed inside the inner
cartonand is bolted to asheetof wood with four (4)bolts
to prevent damage during shipment. Another sheet of
wood is bolted to the underside of the inner carton
through the first piece of wood. First locate the nuts
attachedtotheboltsthatsecuretheouter pieceofwood
to the inner piece of wood. Remove the nuts and with
assistance carefully lift the tensioner assembly from the
innercarton and layit floor. Toremovethe innerpieceof
wood from the base of the machine, raise each end and
remove the four (4) shipping bolts from the underside of
thewoodensheet.Note:Pleaseretain thebolts,wood
and cartons for future shipment.

Assembly Instructions
Stand Upper Post Installation (cont.)
Withtheheight adjustment cap screw on theupperpost
facing the right side of the tensioner, align the four (4)
holes in the upper post flange with the holes in the
tensioner base. Secure the flange to the base with the
four cap screws.
Height Adjustment
The height of the machine is adjustable from 39” to 46”.
To change the height, remove the socket head cap
screw from its current position and place it in the
appropriate hole to set the desired height of the ma-
chine.
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6
Clamp Head Installation
The post of the string clamp head and the tube of the
string clamp base are treated with grease to provide
protection against corrosion during shipping. Remove
anyexcessivegrease withaclean clothpriortouse.The
post and tube may also be cleaned with isopropyl
alcohol. After this type of thorough cleaning, the post
and tube should be treated with a light coating of
machineoiltoprotectthesurfacesagainstcorrosionand
to ensure smooth operation.
Installing the Racquet Mounting System
Align the threaded hole in the bottom of the frame
supportpostwiththeslotintheturntable.Screwthelever
lock bolt with washer into the center hole located in the
bottom of the support post and loosely tighten. Position
the washer with the rounded edge toward the turntable.
Repeat procedure for the support post on the opposite
side of the turntable.
There are two guide pins located in the bottom of the
support post. The outer guide pin may be removed if
needed to provide additional separation space between
themountingarmsformountingsuperoversizeracquets.
Assembly Instructions

String Reel Holder Installation
The string reel holder pin is an 8 mm rod with threads on
both ends, and flat surfaces machined on one end.
Threadtheendofthepinwithouttheflatsurfacesintothe
threaded boss on the right side of the lower column
support. Using the M6 open end wrench positioned on
the flat surfaces, securely tighten the pin to the lower
column support.
The string reel holder can hold up to 5 reels of string
(dependingonthe size of the string reel). Beforeplacing
thefirstreelonthepin,slidetwoM8washersoverthepin
and slide them to the boss on the lower column support.
After the first reel is placed onto the pin, place two
spacers between each reel to provide enough space
between reels and allow them to turn freely without
rubbing against one another. (To provide a smooth feed
to the String Length Meter, place the reels on the pin so
the string spools off the reel from the underside of the
reel.)
After the last reel is installed, place the remaining
spacer(s)onthepinandattach the threaded knob to the
end of the pin.
7

SLM Face Plate Installation
Remove the tape covering the opening on the front side
of the bottom cover to expose the string length meter.
Position the face plate assembly over the opening in the
bottomcover,andalignthetwocountersunk endholesof
the face plate with the threaded attachment holes in the
front of the string length meter. With the two flat head
machine screws, secure the face plate assembly to the
string length meter.
To check for proper alignment, lift the top clamp of the
face plate assembly and insert a section of racquet
stringatleast12incheslongintotheentranceholeofthe
face plate. Continue feeding the string section into the
stringlength meter,until itappearsthrough theexit hole.
Iftheentranceorexitholesappeartobeblocked,loosen
the attachment screws and adjust the position of the
face plate assembly until the section of string exits the
face plate. After the face plate is properly aligned,
tighten the flat head screws.
8

Instructions for Power Connection (Refer to Figure 1)
CAUTION ! Before connecting to the power supply, check the voltage supply switch setting located on the
side panel as shown in Figure 1. To change from 110 volts service to 220 volt service simply slide the
switch fully to the top or to the bottom until “110V” or “220V” appears on the switch plate.
The acceptable range of input voltages for the “110 V” setting is between 110 V and 120 V @ 60 Hz and for
the “220 V” setting, between 220 V and 240 V @ 50 to 60 Hz. If you have any question regarding the input
voltage supply for your area, please ask your electric utility company.
To install the power cord, insert the female end of the power cord into the Power Cord Socket located on the side
panel and plug the male end into a grounded power outlet.
When using extension cords, use grounded heavy duty extension cords rated for 15 AMP service. To connect the
foot pedal switch, insert the 2 pin mail connector located at the end of the foot pedal switch cord, into the two pin
receptacle located in the side panel. Tighten the connector with the sleeve nut located on the foot pedal switch
connector.
After checking to be certain that the machine is set for the correct input voltage, switch on the machine by
pressing the Lighted On-Off Power Switch on the side panel. At start-up, the LED will display a countdown from
“9.0” to “0.0” while the machine performs a self diagnostics check at start-up. The machine should be permitted
to warm-up for 10 minutes prior to stringing. After ten minutes, it is recommended that the “TEST” button be
pressed to self calibrate after warm-up.
Power Connection & Controls
Figure 2 - Front Panel Features
“F” - Split Drum String Gripper
“G” - Tensioning Button Switch
“H” - Control Panel
“I” - LED Display
“F”
“G”
“H”
“I”
110
Figure 1 - Side Panel Features
“A” - Lighted On-Off Power Switch
“B” - Power Cord Socket
“C” - Sliding Fuse Holder w/ Spare Fuse
“D” - 110V / 220V Switch
“E” - 2 Pin Foot Pedal Switch Socket
“E” “A” “B” “D”
“C”
9

Control Panel Functions and Features
Single Digit (0-4)
Memory LED Display Three Digit (XX.X) Tension Settings or String Length
LED Display
Lbs/Kgs Button - Changes tension
display from Lbs to Kgs. Each press of the button
toggles back and forth between Lbs and Kgs
Keypad - Used to enter
tension settings
Speed Button - Changes pulling speed of winder
from Fast to Slow. Slow speed is recommended
for low stretch strings, such as Kevlar. Each press
of the button toggles back and forth between Fast
and Slow speed.
Pre-Stretch Function - Pulls string 10% or 20%
over the tension setting (up to 90 lbs / 40.8 kgs),
releases the string, and repulls to the tension
setting. Each press of the button toggles between
10%, 20% or no pre-stretch.
String Length Meter Button - Enables string
length meter function. Each press of the button
toggles back and forth between Meters and Feet
measurement. To switch back to tensioning
function, press the “Lbs/Kgs” button.
Clear Button - Clears display to enter a new
tension
Knot Function - Increases pulling tension by 10%
over the setting value (max 90 lbs / 40.8 kgs) for one
pull. During pull the Memory LED flashes to indicate
that the Knot function is enabled.
Tension Index Buttons - Changes tension setting
in +/- 1.0 or 0.1 Lb or Kg increments. Holding the
button down will scroll the tension setting values
up or down. Tension settings entered with the
tension index buttons are placed into temporary
memory setting “0”.
Memory Button - Indexes from 4 preset tension
settings that can be stored in memory. Settings are
retained even if machine is turned off. Each press of
the button indexes to the next memory setting.
Memory settings 1-4 must be entered using the
keypad followed by pressing the “ENT” button.
Enter Button - Confirms tension setting when entered
on keypad (display flashes when tensions are keyed
in with the keypad until this button is pressed)
Test Function - Performs internal calibration
check. Press and hold for 5 seconds until the
winder reverses and performs an internal
diagnostic check, such as the one performed at
start-up.
Release Button - Returns winder to starting
position and releases tension
10

String Length Meter Operation
ToenabletheStringLengthMeter(SLM)function,press
the String Length function key on the keypad. When the
String Length button is pressed, one of the Red LED
indicators below “M” or “FT” will light up to indicate that
theSLM functionis enabled.Pressing the StringLength
button will toggle between “M” and “FT” to set the
measurementunitsforeitherMeters(“M”)orFeet(“FT”).
Measurements are displayed in 0.1 increments.
To measure out a length of string from a reel (sets can
also be measured) insert one end of the string through
the string guide grommet (from the backside). While
lifting the clamp pad, insert the string through the
entrancehole ofthe faceplateuntil itappears attheexit
hole and release the clamp pad. (The clamp pads will
prevent debris from entering the SLM.)
Whenthe end of the string appears outofthe exit hole,
press the “C” button on the keypad to “Zero” the SLM,
andthelengthofstringmeasuredwillbemeasuredfrom
the point on the string located at the edge of the exit
hole. Pull the end of the string in a slow steady fashion
and the SLM will begin measuring the length of string
pulled and indicate the measurement on the LED dis-
play.When thedesired lengthofstringismeasured, cut
the string at the exit hole.
NOTE :When reaching the end of a length of string,
pull the string through very slowly to avoid inaccu-
ratestring measurement.Thestringlengthmeter was
designed to measure strings between 1.10 mm (18 ga)
and 1.45 mm (15 ga) at an accuracy of +/- 0.3% of the
indicated value and +/- 2 inches (50 mm) absolute.
When measuring strings smaller than 1.10 mm (such
as badminton strings) the error will be -2.5% of the
indicated value (up to 6” short in 40 ft) and +/- 2 inches (50 mm) absolute.
11

Clamp Head Operation
Toclampastring,lifttheclampheadandplacethestring
between the jaws and depress the clamp head lever to
secure the string. The clamping pressure applied to the
string should be adjusted to provide sufficient pressure
tosecurethestringwhensubjectedtothedesiredpulling
tension. The diamond coated gripper plates provide for
increased friction between the clamps and the string to
allow for reduced clamping pressure while securing and
holding the string under tension.
CAM-LOCK Clamp Base Operation
Rotate the Base Locking Lever clockwise to secure the
clamp base to the turntable.
Reverse the clamping procedure to unlock the string
clamp. The Locking Lever is spring loaded to assist the
unlocking of the clamp base.
The Locking Lever should be tightened enough to pre-
vent clamp base slippage on the turntable, when the
desired tension is placed on the string. To go from the
loose position to the clamped position and back, gener-
ally requires the travel permitted by the clamp base. If
the travel is not sufficient to allow smooth operation of,
adjust the Clamp Base as outlined in the Clamp Base
Adjustment section.
Cam-Lock Clamp Operation
Clamp Head Adjustment
The clamp heads will need minor adjustments accord-
ing to what string type, construction, and gauge you are
using.
To adjust the gap (clamping pressure) between the
clamp jaws, insert the string through the racquet as if
you were beginning the main strings. Clamp the strings
andpulltension.Ifthestringslipsthroughthejawsofthe
clamp, tighten the clamp by compressing the clamp
jaws together by hand while turning the Adjustment
Knob, in the clockwise direction. If the clamp leaves
impressions or damages the string, it may be exces-
sively tight and should be adjusted by turning the hex
screw counter clockwise to open the gap between the
jaws.Theclampjawsmustbecleanedperiodicallytobe
free from dirt and any residue for them to grip properly.
Note: The string clamps supplied with your stringing machine can accomodate tight string patterns such as
badminton. Depending on the string pattern, the clamp may spread the strings slightly which will not compromise the
quality of the string job.
Adjustment
Knob
12

13
String Gripper Operation
String Gripper Operation
To insert the string in the split drum string gripper, wrap
the free end of the string clockwise around the gripper
drumandpositionthestringbetweenthegripperjawsas
shown in the illustration.
The string must pass over the top half of the gripper
beforebeingplaced betweenthediamond coatedplates
of the upper and lower gripper jaws. Excessive slack in
the string should be removed before applying tension.
As the drum turns and applies tension to the string, the
upperjawisforceddowntoclampthestringbetweenthe
jaws.
CAUTION ! Never tension a string with your finger
between the string and upper gripper jaw as serious
injury could result if your finger is caught between
the string and upper jaw during tensioning. CHIL-
DREN SHOULD NEVER BE PERMITTED TO OPERATE THIS MACHINE WITHOUT ADULT SUPERVISION.
Tensioner Operation
Setting the String Tension
String tensions may be entered using the keypad and
storing the settings into one of four memory storage
settings (See section on Control panel Functions and
features) or by using the tension index buttons. While
tension setting is entered, the value displayed will be
flashing until the “ENT” button is pressed, indicating that
the tension setting is accepted.
Tensioning a String
After wrapping the string around the gripper jaws,
pressthetensioning buttonswitchonthefrontpanelof
the machine, or press the foot pedal switch to activate
the tensioner. The using the fast pulling speed (see
section on Control Panel Functions and features) the
tensioner will start pulling at full speed and then slow
down as the tension in the string approaches the
tensionsetting. Whenthetension inthestring reaches
the tension setting, the LED display will begin to flash,
and the string will be ready to clamp off. In the event
thatone of thekeys on thecontrol panel areaccidently
pressed while tensioning a string, the tensioner will
automatically reverse and release the string being
tensioned.
Tensioning
Button

Mounting the Frame
Adjusting the Frame Support Posts
Place the racquet frame over the center support slide
andontotheframesupport.Loosentheleverlockbolton
one support post. Slide the post outward until the center
support of the racquet support slide is positioned near
theinsidesurfaceof theracquetframe. Securelytighten
the lever lock bolt.
Adjust the opposite post using the same procedure.
Caution: To avoid racquet damage, the support slide
should not contact the racquet prior to fixing the support
posts.
Securing the Shoulder Supports
Secure the racquet frame with the shoulder supports by
rotatingthe largeadjustment knobsonthe outsideof the
support post assemblies clockwise. Adjust the supports
untilfirmcontactismadebetweentheshouldersupports
and the frame.
The tear drop shaped holes towards the back of the
shoulder supports are handy for holding the loose
end of the string while pulling the string through the
racquet. Simply insert the loose end into the tear
dropshaped holes and slide thestring intothe point
of the hole.
Shoulder Support Adjustment
Theshouldersupportsareadjustabletoprovidesupport
to the racquet frame. Loosen the knurled knob at the
bottom of the shoulder support and swivel the support
sothatthepadswillcontacttheframesquarelywhenthe
arms are closed against the racquet. Should the shoul-
dersupportsblockstringholes,adjustthepositionofthe
racquet between the arms until the shoulder supports
contact the racquet between grommet holes.
14

15
Mounting the Frame
Support Slide Adjustment
Oncetheframesupportpostsaresecured,lightlytighten
the support slides by turning the knobs on the outside of
the slides clockwise. Adjust the slides in equal incre-
ments until slight resistance is felt.
Apply a final adjustment to all racquet support points
until the racquet is firmly secured in the mounting
system.
Should the frame supports lose contact with the frame
while stringing, they should be adjusted, as needed, to
maintain contact with the frame.
Stringing the Frame
Installing the Cross Strings
Weavethecrossstringsoverandunderthemainstrings
being careful to alternate the weave direction of each
consecutive cross string so as to be opposite of the
previously installed cross string.
Oncethe final cross string is tensioned and clamped, tie
off at the appropriate hole specified by the racquet
manufacturer.
Remove the strung racquet by loosening the shoulder
supports and support slides in small increments until the
racquet is free from the mounting system.
Installing the Main Strings
To begin stringing the main strings, insert the two ends
of the string through the two center holes at the appro-
priate end of the frame and continue through the center
holes on the opposite end of the racquet.
Secureone of the stringsusinga string clamp andinsert
the free end into the string gripper.
When tension is apllied to the string, clamp off the
tensionedsectionofstring,releasestringfromtensioner,
andproceedto threadstringintonextsets ofholes.After
the last main strings are pulled, tie-off the strings at the
appropriate hole specified by the racquet manufacturer.

16
Pathfinder Awl Operation
The machine includes the new Pathfinder stringing awl
which creates a pathway between or around strings to
make inserting a string through tight grommets easier
and quicker.
Insert the awl through the grommet hole in the same
manneras fortraditional awls. The Pathfinder awl must
be in the closed position before insertion.
Once the awl is inserted, pull the handle of the awl
outward while holding the tip section in place, leaving
the outer sheath in the grommet hole.
Insert the end of the string into the center of the sheath.
While holding pressure on the string, slowly pull the
sheath out of the grommet hole to leave the end of the
string exposed.

Tensioner Calibration
If the bases of the Cam-Lock clamps slip on the glide bars, the base
locking levers may need adjustment.
Remove the plastic cap by pulling straight up on the edges of the cap.
Line up the large hole in the clamp base with the smaller hole in the
locking cone as shown.
Each stringing machine has been checked and calibrated at the factory using accurate load sensing devices to
ensure that the machine pulls at the correct tension. The tension is then controlled by the pre-set factory settings
of the electronics. However, if you suspect that your machine is not pulling at the correct tension, or if you would
like to check the pulling tension using a tension calibration device, you may do so.
Most tension calibrators (such as a Gamma Tension Calibrator) function by inserting a string from end of the
calibrator into a string clamp, and pulling on the string located on the opposite end of the calibrator. The tension
measured by the calibration device will then display the tension being applied to the calibrator by the machine.
With the machine set for the fast pulling speed, and the tension set at 20 lbs., place the string from one end of the
calibrator (preferrably equipped with synthetic string) into a string clamp. Place the opposite end into the string
gripper and apply tension. If the tension indicated on the calibrator does not match the tension setting, release the
string and remove it from the gripper.
Pressandholdthe“Test”buttononthecontrolpanelfor5secondsandreleaseitwhen thewinder rotates
in the reverse direction and the machine performs its own self diagnostic test. After tension display
returns to the preset value, recheck the pulling tension using the tension calibrator at both 20 and 60 lbs.
In the event that the measurement from the calibrator does not match the tension setting, the machine can be
externally calibrated by up to +/- 5 lbs from the factory settings. If the difference between the measurement from
the calibrator and the tension setting is more than 5 lbs. call the machine service department of GAMMA Sports
at 1-800-333-0337 for assistance.
To calibrate the machine externally, set the machine for a pulling tension of 40 lbs. With the
calibratorattached,pressand holdthe“TEST”button until aflashing“9”appears onthedisplay.
Pressthe“+0.1”or“-0.1” buttons,tomatchthedisplay valueto thecalibratorvalue.Press“ENT”
to save the calibration settings.
Cam-Lock Clamp Base Adjustment
Insert the 3MM hex wrench through the holes and into the screw located
in the base. Rotate the wrench clockwise to tighten the clamp and
decrease the base locking lever travel. Rotate the wrench counterclock-
wise to loosen the clamp and increase the base locking lever travel.
17

Cleaning Instructions for String Clamps
To thoroughly clean the diamond coated surfaces of the
clamp heads, remove the adjustment knob screw, lever
plate, and compression spring to expose the inside
surfaces of the clamps. Using the cleaning stone pro-
vided with your machine (you can also use a small tooth
brush or a sharpening stone for knives), scrub the
diamondcoated plates until alldebrisis removed. Clean
any dust or residue with a damp cloth and re-assemble
the clamp head.
To thoroughly clean the diamond coated surfaces of the string gripper jaws,
remove the gripper drum from the motor shaft by loosening the drum
attachment screw located at 5 o’clock on the side surface of the gripper
drum, and sliding the gripper drum off the shaft.
Note:Toprovideeasieraccesstotheattachmentscrew,pressthetensioning
buttonswitch torotatethe gripperdrum.When thescrew is positionedat the
topofthedrum,switchthepoweroffonthemachinetostopthegripperdrum
from turning and remove the screw.
Cleaning Instructions for String Gripper
Remove the gripper jaws from the gripper drum by removing the 4 cap
screws that attach the jaws to the drum. When removing the grippers, take
care to not loose the compression springs inside the cavities of the lower
gripper jaw. With the gripper jaws removed from the drum, using the
cleaning stone provided with your machine (you can also use a small tooth
brush or a sharpening stone for knives), scrub the diamond coated plates
until all debris is removed. Clean any dust or residue with a damp cloth and
wipe down the gripper drum surfaces to remove any residue as well.
To re-assemble the gripper jaws to the drum, fit the springs over the spring
retainers of the upper jaws and fit the upper jaw to the lower jaw. While
holding the jaws together position them onto the drum and align the holes
in the jaws to the holes in the drum. Re-attach the jaws to the drum with the
capscrews.Theholeinthedrumforattachmentoftheupperjaw hasasmall
set screw inserted into the hole from the back side of the drum. This set
screw was adjusted at the factory to provide the proper engagement of the
upper jaw screw with the drum. When tightened the upper jaw should slide
freely up and down. To tighten the upper jaw screw, place a hex wench in
the small set screw located on the back side to hold it in place when the
attachment screw on the front side is tightened.
18