Dickie,since you have to MAKE a lathe driver for that shaft,what do you intend to do? Make sure you post pics too.
I had to make a butt and shaft driver for justinb386's Brunswick/Joss which has an odd 5/16-13 pin.
The butt was no problem,I just drilled and bored out a Delrin sleeve to .280,and screwed it onto the butt,using the pin as a tap.
The shaft was pretty easy too,I just went to a local manual machine shop and used their lathe and my own 304 SS and cut it myself.
What you have there is a unique piece for sure. Tommy D.