What is the thread for the steering wheel nut.

[motto (RIP)]

Originally Posted by Jim Burrill

Have I stumbled across some odd thread only used to trap the steering wheel on the shaft? I really doubt that - - but odder things have happened!

It's quite possible that this comment is closer than you think Jim.
I haven't checked it out completely but the nut that holds the steering wheel on the Chev CMP seems to be an oddity and I believe to be the same as the CCKW which appears to be the same as Dodge WC and I think M37 and who knows how many others. These are tubular shafts but I would imagine the U/C had a solid shaft. However:
To approach the question from a different angle perhaps you could give a description of the original example in your possession and see if it compares with anything else out there.

David