"
BTW I assume that you mean with FR-64 the 64S (S=steel).
There is also an FR-64 with aluminum arm wand and round
lateral balance."
I have one of each, one is the 'S' (With "Silver Wire Inside" sticker) which is at the Ikeda shop in Japan right now getting refurbish/regrease/rewire with Ikeda silver, the other, which has the "round lateral weight" is mounted to my SL1000 MK2. I have seen 2 different places spec both of these arms as to having the same effective mass, one says 35 grams, (vinyl engine) the other (1986 Stereo Review Stereo Buyers Guide) says 30 grams.
How much 'better' is the 'S' model?
I plan to use the 'S' version when I get it back from Ikeda on my newly acquired SL1000 MK3.
Hopefully the guide pin issue is solved soon, still waiting.