I realize I'm reviving a 5 year old thread, but I'm doing so with good reason.

Shortly after starting this thread, we sold our place and moved. As a result, this project got put off. This project has been wrapped in an oily old t-shirt and only brought out here and there to make sure it wasn't rusting or the like.

I got to getting into tearing everything down to start working on it and bringing it back to life. As a result, the screw that goes through the rear of the trigger guard holding it to the bottom of the wrist had to be drilled out. Soaking for several weeks, heat, and other methods didn't get it loose and the chewed up screw head (like that when I got it, you can see in the pics) broke half of it off. Sucker was flat siezed up and took some work.

I have a small ring of old screw still in the threaded side of the wrist I'm working on figuring out how to get out without damaging the threads. However, what I can see of the threads I'm half afraid someone before me may have boogered them up a bit.

As such, I'm working my head around the next steps and wondering if I'm going to have to chase the threads when I get the ring of what's left out. Trying to make sure I've got the right threads, though. From what I'm finding, it is a Britishicon 4BA thread? So I'd be looking for a 4BA tap, if that's the case.