UC: That is basically correct. If you picture the hammer stem coming up with a lump at the top. In this lump there is a slot cut that the hammer spur and firing pin actuater device which is really just an insert into the slot with a pin holding it in and allowing it to rotate enough to bypass the firing pin when depressed down and contact the firing pin when lifted up about 3/8 of an inch. I would try to include a picture but I have not mastered the picture thing for these forums as yet. Someone sent me the directions which just confused me more than the description I just made probably does you.