Hello, i was cycleing the action when my thumb slipped off the hammer and when i thied to pull it back again no go it was locked up, i disassembled the gun and the hand was broken in hallf and the little spring fell out, i have a old 1851 from the late 70,s on display and decided to do a little experament and removed the hand and hammer from the old and installed it in the new, well to my amazment it works perfect [no filing needed], timing is spot on and trigger pull is the usual 2lbs, boy did i get lucky, i am going to order another hand from vti or the whole kit from cabelas, pghrich