Hexagonal spanner for Fidelity Research FR 66S tonearm

you might pass this on to whom you sell it to

"

thuchan

1,009 posts

04-21-2013 at 12:29am 

Pani,
in the case of the FR-66s you may neglect the compliance issue. We made many tests with nearly all available MC carts, MI carts and new as well older MM designs on the FR-66s. No problem at all. It is the most universal arm ever built."

from this discussion of the 66S here

https://forum.audiogon.com/discussions/question-on-fr-66s

I apologize ahead of time for the bald spot you might make scratching your head trying to ascertain what's 'best'.

this one has a heavy weight with two flat spots for a tool to tighten/loosen

this one has a hex nut

someone could have changed it, I had to buy a nut for one of my friends Micro Seiki 505's. 

You have the arm board loose, take it with you to a great hardware store.

this heavy ring has no flat spots, it has two holes, you temporarily put a rod in the hole and tighten it with the rod. Note, you want a washer below the board, above the heavy ring. Scroll up, the top ring with flat spots also has a hole so it can be tightened/loosened by that method also, in case a tool won't fit.

My prior undisputed favorite arm, very unique magnetically controlled Acos Lustre GST-801 (I got with help choosing and finding from members here).

I like my restored JVC Victor UA-7082 equally, and it has the advantage of being 11-1/8" effective length, so it’s my new favorite. Both have removable headshells.

Elliot, In your first photo, that huge nut with two flat sides is the unique nut for the B60 base.  That's a costly option that facilitates VTA adjustment and also adds mass to the tonearm base. Without the B60 base, the nut is hexagonal and much less massive, and you adjust VTA with set screws as shown in your last photo.

Believe mine is like Elliot's, with the 2 flat sides. Am hoping to find the right tool locally.