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Help me with a Fidelity Research FR64 part

I got a mint FR64 tonearm at a great price. Sadly there was a catch it did not have the nut that fastens the arm at the base. It is a really fine thread (25 threads per inch) in fact my machinist doesn't have tooling for this.

so I want to know if anyone out there knows where I can get the said nut, or if they have one they can sell me - thanks
parrotbee
parrotbee OP
103 posts
 
I'm afraid that the FR64 has a significantly finer thread than a standard metric/imperial machined thread - that is why I started the post...
bydlo
142 posts
 
If a machinist cannot recognize the thread within 20 seconds run away from him, he is no good! It’s not a rocket science, I extracted the arm from the alu threaded male collar, brought it to a machinist and have it redone in stainless steel with a massive brass nut.
lewm
12,460 posts
 
It’s likely to be metric.
You could by a thread gauge and possibly luck out with a standard metric pitch. A caliper will give you the diameter.
Post removed 
chakster's avatar
chakster
6,144 posts
 
I have the original part you're looking for, along with the whole original tonearm base, feel free to make an offer 
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