I don't know about the Galazan screw set but a while back I needed a screw for a DHE Parker forend and I had to have one made up in a machine shop. I remember the shank was a #10 but I don't remember the pitch. Maybe it was 36 tpi??? The thread diameter was undersize as compared with the current industry standard. Sounds like this is similar to your problem. The split die would work and I'm sure you can find one at Brownells and/or McMaster. It's going to be tough to grip the screw to cut the thread undersize, without damaging the screw slot or the shank. I've done that myself by squeezing it in a vice between two pieces of soft aluminum flat stock. Hope this helps. Silvers
