I am wondering how the effective mass can be so low as "14 to 21 gm", which was stated somewhere above. If you think of it, the stylus/cantilever is swinging the whole enchilada all the way back to the stationary pivot that bears the rotating pivot apparatus. Thus the effective mass would be the additive of the masses of the swing arm, the base and pivot assembly at the tonearm proper, the counter-wt, and the arm tube/headshell. But perhaps that is not the proper way to think of it, or perhaps the LT components are made of extremely light weight materials.
The error in my thinking: Yes, the effective mass is high in the horizontal plane, because of all the paraphernalia necessary for the LT function, but it is only affected by the masses of the arm tube, headshell, (cartridge), and counter-wt, in the vertical plane. Many tonearms are similar in that characteristic.
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