I for one disagree with the above in general.
I have experimented with various weights, clamps, record mats,
...etc.I have found that the Lp should be as decoupled as possible from any mechanical bearing. Using a screw down clamp only couples you more than before. This is not good Therefore I prefer a record weight purposely designed to use light weight yet researched materials to maximize the resonance dissipation during playback.

