DARTON Tundra Extreme
Instructions
A Technical Bulletin
The following information is to assist
you in maintaining maximum performance
from your C/P/S Extreme bow.
There are 5 tuning marks on the CAM
and 5 on the Control Wheel. They are let-
tered A - E and enable you to check the tune
of your bow at any draw length adjustment.
All you need to do is align the cables with
marks labeled the same as the position you
have used for the bowstring anchor. If the
bowstring is anchored in the 'C' position be
sure the cable lines up below the tuning
mark labeled 'C' as shown in the diagram.
Once the bow is in correct tune it will
continue to be in correct tune at any draw
length adjustment of the module or bow-
string anchor without any additional work.
This can be easily checked with a quick
visual look at the cables and tuning marks.
To change draw lengths put the bow in a
bow press and remove the tension from the
cables.
Changing the bowstring anchor location
by one hole changes the draw length by
1/8". Adjusting from 'A' bowstring anchor
location on the Control Wheel to the 'B'
location without changing the module loca-
tion increases the draw length by 1/8".
Adjusting the module one location (1
through 5) without changing the bowstring
location changes the draw length by ¼".
It is recommended that whenever an
adjustment is made to change the draw
length over 1/8" that you reference the chart
and stay as close as possible to one of the
five combinations indicated to maintain
optimum stored energy.
I. POWER CAM (bottom cam)
Align the power cable (the split ended
cable that attaches to the top axle) below
the tuning mark on the Power Cam (figure
1) that corresponds with the bowstring
anchor position on the Control Wheel, as
indicated in figure #2 . If the power cable
passes above the tuning line (viewed from
the same perspective as figure 1), then twist
the power cable enough to line it up cor-
rectly.
If the power cable passes too far below
the tuning line, then UN-twist the power
cable enough to line it up correctly. In the
event that all the twists are out of the power
cable and it still passes below the bottom
tuning line, put twists in the bowstring and
start this process over.
II. Control Wheel (upper wheel)
The adjustment of the control wheel
affects nock travel and influences the prop-
er location of the nockset. Even an out-of-
spec. adjustment does not result in a diffi-
cult bow to tune, but attention to the correct
adjustment will result in the most forgiving
set-up. Align the control cable (the cable
that attaches directly to the upper wheel)
with the tuning mark on the Control Wheel
that corresponds with the bowstring anchor
position on the Control Wheel, as indicated
in figure #2 .
The bow string must remain anchored
in the same position on the upper Control
Wheel as it was while tuning the lower
Power Cam.
If the control cable passes above the
tuning line (viewed from the same perspec-
tive as figure #2), then twist the control
cable enough to line it up correctly.
If the control cable passes too far below the
tuning line, then UN-twist the control cable
enough to line it up correctly. In the event
T
UNING
T
IPS FOR
D
ARTON
C/P/S B
OWS
that all the twists are out of the control
cable and it still passes below the tuning
line, put twists in the bowstring and start
the processes for both the Power Cam and
Control Wheel again.
III. Draw length adjustment
Optimum stored energy and level nock
travel are maintained through out the entire
draw length range of your bow if the fol-
lowing instructions are observed.
All draw length adjustments must be
made in a press.
C/P/S Extreme bows use an adjustable
module system to provide a wide range of
usable draw lengths. Each module has five
adjustments of approximately 1/4" incre-
ments giving a total 1" adjustment of draw
length. The upper Control Wheel has five
bow string anchor positions. This provides
1/2" of additional draw length adjustment
in approximately 1/8" increments. This
adjustment maintains optimum stored ener-
gy if done in the manner described in figure
#4.
1. Adjusting the draw length within the
range of the installed module involves loos-
ening one screw and removing another.
Loosen the button-head screw found in the
slot near the draw stop portion of the mod-
ule. This screw is visible by looking at the
far left side of the Power Cam pictured in
figure #1. After loosening the button-head
screw, remove the adjustment screw from
the opposite side of the Power Cam (see
#2
C
A
E
BOWSTRING
POWER CABLE
CONTROL CABLE
(LOCATED BELOW
“C” TUNING MARK)
FLAT HEAD
BOWSTRING SCREW
CONTROL WHEEL
FIGURE #2
Rev. 11/03
Install Included
Optional Draw
Stop Cushion
Bowstring
Control Cable
Power Cable
(Located Below
“C” Tuning Mark)
Module Lock Down
(Buttonhead Screw)
Tuning
Marks
