Posted by David Williamson on August 30, 2015, 12:56 pm, in reply to "firing pin bushing"
I would take the locks off and where the back of the firing pin comes through use Break Free or Kroil and use the tube to aim it so it goes into the bushing hole. Take some plumbers putty and put in around the opening on the breech to contain what you sprayed in.
I have a few with the bushings and one or two that have the copper set screws. I couldn't get the set screws out so left it alone. I just wanted to clean out the bushing hole.