Those strings seem to love tangling every time I put the cocker in my fanny pack - just be patient and careful. Finally, pay close attention to the instructions warning that all 4 cocker strings must come forward from the bottom of the cocker. The cocker works now - at the top of the stroke the crank just clears the bowstring as the bowstring pulls the safety into the 'SAFE' position. Second issue - the sled was just a bit too narrow to fit over the rail on this bow - again, very gingerly and gradually widened the opening on the bottom of the sled until it would fit onto the rail - being very careful not to weaken the hooks that fi t onto the bowstring. BUT I had to use a fine rasp to carefully remove some of the hard rubber at the front of the comb of the buttstock so the cocker could slide into place - it slides in and fits perfectly now. The Silent Cocking Cranks allows archers to safely disengage the crossbow at the end of a hunt with the decocking capabilities. This crossbow is fairly easy to put together. Its speed is 175, draw weight is 70 pounds, weight is only 2.2 pounds, and length is 22 inches uncocked. This self-cocking crossbow comes in a compact and precise design. I had to buy two 1 1/2' 10x24 cap screws because the ones provided were too short for my bow - then the mounting bracket fit nicely and absolutely snugly. 4) Bear X AC90A0A160 Desire Crossbow Pistol. But the Bear video about this cocker said it would fit all the X model bows.well almost. The tech rep at Bear archery told me they did not have a crank cocker for my crossbow - a Bear X Trek 380.

Cocker will fit a Bear X Trek 380 with careful modifications

Crank for bear crossbow