I was wondering the same thing myself.

 

If one looks at the spool area where the string goes in, it should fit into a small
hole and have a secure knot so it will not come out. The string is one piece
so each end is fastened the same way.
The string is one continuous piece. I have several other style crank cocking
devices that are assembled the same way. One can do an internet search and
purchase cord in bulk, usually 20 foot length on a spool. Here is a picture of the
type I use on all my different brands of crossbow cocking devices.

One word of caution: a device that uses only one string , if it breaks while cocking,
the crossbow can be damaged plus possible personal injury.
Barnett's older crossbow cranking device uses two separate strings with one end of
each anchored to the stock. The other end of each anchors to the spool. I add a wee
dab of Gorilla Glue to the knot as extra insurance against it coming undone.
Wishing you all the best.
Take care.

 

If one looks at the spool area where the string goes in, it should fit into a small
hole and have a secure knot so it will not come out. The string is one piece
so each end is fastened the same way.
The string is one continuous piece. I have several other style crank cocking
devices that are assembled the same way. One can do an internet search and
purchase cord in bulk, usually 20 foot length on a spool. Here is a picture of the
type I use on all my different brands of crossbow cocking devices.
View attachment 310847
One word of caution: a device that uses only one string , if it breaks while cocking,
the crossbow can be damaged plus possible personal injury.
Barnett's older crossbow cranking device uses two separate strings with one end of
each anchored to the stock. The other end of each anchors to the spool. I add a wee
dab of Gorilla Glue to the knot as extra insurance against it coming undone.
Wishing you all the best.
Take care.

Since my C2 crank has one string I replaced it with Amsteel Blue.
Bill

 

The problem is you can’t see the spool; it’s encased. Trying to figure out how to get to it.

 

Look at the handle and see what holds it in place? If glued one may be out of look.
Fully unwind the string and look at the spool to see if it has a set screw or small Allen screw.
The crank devices I have use a small screw to hold each spool on. The bottom of the crank
orange handle has a small spring loaded Allen screw that puts pressure on the ball to fit into
a groove in the drum shaft.
Here is a picture of the ones that I am using. My earlier version had a couple of lugs that
when the handle was installed a wee bit of a turn locked the handle to the spool. Either
version, the handle would fit either end of the drum shaft. I use one of the outer holes to
push the new string in. If one ties sewing thread to the old string after removing the knot
one can remove the string and then tie the thread to the new string and carefully thread it
back in. The blue handle is the older version. I have both versions. Originally for the
Carbon Express and the orange one is for the rebranded Rocky Mountain crossbow.
I have modified the butt end of the stock on all my crossbows to use this plug in design.
Note: no reverse draw or accu slide crossbows for me.

Here is picture of the Wrath crank cocking device I am referring to.

Wishing you all the best.
Take care.

 

Thank you for your thoughts. I bookmarked it so when the time comes I will give it a try!