rgh25
For Metric and odd size taps and dies,try Victor Machinery Exchange.( www.victornet.com ).You are not likely to be able die thread a screw this short.I watched a German engraver make a screw he lost from one of my guns. He turned a "nut" onto a piece of threaded rod, heat the nut/rod end to bright red and "forge weld" them together.With a file, and rolling the screw on the side of his workbench,he turned the head round,filed a slot,cut it to length,and engraved it to match."Zip,Zip,Zip", just as quick as that, he had a screw with thread all the way to the head.Watching this was worth more to me than the loss or the screw.Maybe the same method will work for you,but you would have to make your own "nut" and threaded rod, with tap&die from VME. If you ID the thread,New England Custom Guns may be able to help you.Good luck.
Mike