Dan_ed, Good point about the tonearms that can accommodate two counter-wts, but as Dave mentioned, the range of adjustment of effective mass afforded by that arrangement would seem to be quite limited.
Mark, Despite the setback you described, do you continue to pursue a Dynavector-like tonearm design where the vertical effective mass could be adjusted? I wonder whether your final solution to that problem would be retro-fittable to my DV505, eventually. Actually, what I do now is just change headshells as and when needed to change EM. That obvious ploy does not allow "on the fly" adjustment to max out the performance of a given cartridge, however.
Mark, Despite the setback you described, do you continue to pursue a Dynavector-like tonearm design where the vertical effective mass could be adjusted? I wonder whether your final solution to that problem would be retro-fittable to my DV505, eventually. Actually, what I do now is just change headshells as and when needed to change EM. That obvious ploy does not allow "on the fly" adjustment to max out the performance of a given cartridge, however.