Jose ,just reread your post You were talking of an O/U and I was thinking side by side . Sorry about . What you again you need to consider the free float question ,O/Us generally have more than side by sides . I would allow the pin to come out a maximum of .075" only protrude around .040"when resting on the hammer when fired . O/u tend to be a little more individual than SxS so it may mean you have to taylor each pin to each gun. Must admit that I have done so many that I largely do them "by eye " these days ,even so they some times need a bit of fine tuning ,depending on the rebound in the hammers .