I've posted on this before and thought I'd post again because it's been a long time and made some progress. I bought a new barrel for my Third Model double action 38 from Numrich awhile ago. From what I've read, trying to find info on this seems hard, others have too. The description says that the barrels were in the white and needed a forcing cone cut in them. Mine had forcing cone and crown done. The problem was they had no base pin, so you need to provide one. I could do that. Where it got funny was no one seemed to know how this base pin came out of an existing barrel. Threaded, pressed? At least mine (maybe all) is threaded. I made a square piece out of aluminum with the right size hole drilled in it and made a slit through it as so it would clamp on the base pin tight in a vise. Heated the barrel up a bit and tapped on it with a rubber mallet counter clockwise, and, it threaded out. But, as near as I can tell by micrometer and magnifying glass it is .356 diameter and a 54 tpi cut. Very fine work. Now, the new barrel has no threads tapped into them for this, but is drilled to a proper or close tap drill size hole. Threads are the part that needs the work. I've looked high and low, Brownells, custom, no avail for a tap. Does anyone know of such a thing? 9mm x .5 is close, but not quite. I find 5/16 x 56, 11/32 x 32, and 3/8 x 56. Also close but won't do. Any help is appreciated.
Thanks, Aaron.