Thanks, JDW. Do the bushings simply unthread? (I don't see any copper retaining screws). Or do the locks need to come off first? In other words, how do I pull the firing pins? All I've done so far is to load two empty 10 gauge shells with primers and pull the triggers. Right barrel fired, left one didn't. End of firing pin is very blunt with a slight crack. So figure I need a new left pin, and might as well change both. The left bushing is in pretty bad shape, so I figure I'll change both bushings.