That's an amazing write-up, Ekki!! I was one who mentioned using Koetsu stones with 40:1 gain, and now I agree that's a bit too much (but workable). Indeed, around 20:1 is about perfect!
I actually just acquired an FR64S for the sole purpose of running my best Koetsus, and am about to begin the journey of getting it mounted on my Master Innovation. If nothing else, simply a gorgeous arm to look at, once the cruft of 40 years' time is polished away (finely crafted stainless steel is such a beauty). I've had an FR64fx for years on a SOTA that sounds fabulous with any Koetsu and most of the Ortofon Cadenza (excepting the Black model, which must be too high in compliance for a good marriage). But the stainless 64S is reportedly even better for Koetsu than the aluminum 64fx.
After 5 years, I just feel the urge to move on from the Graham Supreme arm for my Clearaudio table - for one, the armwands are much more expensive and annoying to collect than headshells.
