Fidelity Research FR64s Effective Mass?

Does anyone out there have the effective mass of the Fidelity Research FR64s (stainless steel arm tube) tonearm? If so, what is the source of your information?
this should help
Approximate effective mass: 35 gm including screws
Headshell mass: 20.5 gm

Source: Hi Fi Choice No.24, Turntables and Tonearms by Martin Collums, copyright 1981