Well, after reading the relies, i got out my eye loupe, and had a much closer look. it turns out you guys were correct, it is a thru pin. it must have been a little long, or driven a little deep, because it was blended almost perfectly flush. and yes, i do know about checking cylinder gap,and all the rest. a good friend (who passed a couple of years ago) taught me an awful lot about gun smithing. i have been doing repairs on my own guns for years. i would not call myself a gun smith, out of deep respect for their profession. and i know my own limits. i have had to visit the gunsmith several times when i felt uncomfortable, or needed a real professionals eye or hand. thank you for the quick replies. i really do miss my youthful eyes.