The silver base on ZYX cartridges is not the same as adding a flat head shell weight, like the VPI weight.
The silver base is not flat on the bottom, but contoured to fit "up to" and contact, the moving coil "engine", and damp vibrations throughout the cartridge body, in addition to, adding effective mass.
The silver base is not flat on the bottom, but contoured to fit "up to" and contact, the moving coil "engine", and damp vibrations throughout the cartridge body, in addition to, adding effective mass.