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
Chakster, does your replica B-60 have a serial number on the top like a genuine B-60 would have?
I am curious if the one I had was a replica.
Thanks Chakster! I received the nut and washer promptly, but did not get around to mounting it until this weekend, with help from my local dealer. Had to scrap off a bit from Swissonor’s arm board and the interior of the plinth, but was able to do so pretty cleanly and it does not show with the arm mounted. Got the exact pivot to spindle and arm height that we wanted. It sounds and looks great. Too bad the B60 base won’t fit. Actually, the washer didn’t fit either, but my dealer has some tools that could shave off part of the washer to make it fit. TD 124 has a low platter. Since this arm sits very low, I think it's a great match.