Increasing tone arm effective mass?

It can work, but since energy transmission between each cartridge and tonearm is unique the only way to know how well (or badly) is to try.

The idea is not to increase VTF of course. You adjust after adding a weight so that downforce remains constant. Not really like the old penny trick at all.

- different materials sound different
- mounting above vs. in contact with the headshell sounds different
- whatever you do, make sure your mounting is still rigid