Got a call from the machine shop. They matched the thread for the sample nut and also the clay impression I made of the spindal.
They say it is a UNF 3/4 16 60 degree.
That matches also what Lynn said.
They are cutting a chunk of steel for me to test fit and then machining the nut and the flange for me.
No idea of cost yet. I need it and they can do it, and I have been happy with the work they did drilling all the holes in the Humber Gun mantle.
SO, I am getting three made up. 1 for my Mk1, another for Lance's Mk2 that I somehow lost, and one spare.
If anyone is interested in the spare, let me know.
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