Am I seeing a gap at the rear of the hammer stud---as if the hole was worn/damaged (which seems highly unlikely)? Continuing with my highly overactive imagination, were that to be the case, then the slightest movement of the hammer (to the rear) spells hair trigger---or even BANG. And if my mental picture is even close, then any effort to "push off" is going to make the hammer "want" to revolve about a point somewhere in the front half of the hole (I think)---resulting in some rearward movement----if there's anywhere for it to move---and another BANG.

I apologize if all this is as clear as mud. I know what I want to say. Whether or not I'm saying it (or even thinking about it) in a way that makes any sense is another matter altogether. With any luck, the hole is perfectly round, and all this bovine excretion is just that!!

Ralph Tremaine