Thanks, David. It does have the copper locking screw, which I am unable so far to remove. I've had it soaking in Kroil, but I don't know if it is penetrating at all. I've tapped it gently with an impact driver, but I don't want to push it. I figure I can work the new bushing in around it and use Loctite. The old bushing was so messed up I ended up chiseling it out with a tiny screwdriver. The bushing metal was soft and would almost peel away like aluminum. It didn't hurt the threads on the breach at all. I'll study your schematic and see if I can match my scruffy pin to it. It's looking like the 'small' is going to be closest.