Tonearm for Technics SP-15

If one is obsessed with that grounding system, best to make a ground wire with a banana jack of correct size to fit the female ground receptor in the base, and then use modern high end phono cables to carry the signal. (That would be my opinion.) In my one experience, 40 year old Technics cables didn't sound very good, or certainly less good than modern eqivalents.

Just to be clear, by "fat" I meant to suggest that it is wide in diameter at the base which requires a much larger than average hole in the tonearm mount board.  Also, my personal bias would be to hard wire the IC to the base, thereby eliminating a pair of RCA jacks in the signal path.  JP, have you ever done such a mod?

I own a B500 with the EPA250 arm wand and a 501H.  Unfortunately the base is so "fat" that it really will not fit any of my turntables except my TT101. But I have an FR64S mounted on the TT101 specifically for low compliance LOMCs.  I'd have to machine a new tonearm board for the B500.  (I use a solid aluminum armboard that is further braced from below by fastening to an even larger piece of alu.) But the B500 is an esthetically beautiful piece of precision engineering the likes of which would cost a fortune in today's money.