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.


