Dear Michael: I don't know with which cartridge are you working in your Rockport tonearm.
My advise is that first than all you have to know which is the frecuency resonance between your tonearm/cartridge combo, if the resonance frecuency is between 8-12Hz you don't have to worried about. The formula is:
f=1/2pi x square root: 1/mc, where pi= 3.1416, m is the mass of the system= tonearm effective mass+cartridge weight, and c= cartridge compliance.
I don't like to put anything between the cartridge and the headshell. I think is better to add mass on top the headshell like Tom advise.
Regards and ejoy the music.
Raul.
My advise is that first than all you have to know which is the frecuency resonance between your tonearm/cartridge combo, if the resonance frecuency is between 8-12Hz you don't have to worried about. The formula is:
f=1/2pi x square root: 1/mc, where pi= 3.1416, m is the mass of the system= tonearm effective mass+cartridge weight, and c= cartridge compliance.
I don't like to put anything between the cartridge and the headshell. I think is better to add mass on top the headshell like Tom advise.
Regards and ejoy the music.
Raul.