Referencing weights / Clamps, I have used all Three Turntable Motor Drives and found BD the most reactive to weight, so can see how a Clamp may prove to be a decent method.
I have not used a Clamp it has always been weight, used at differing grams, materials and composite materials on ID and DD Motor Drives.
Weights have been used regularly as a differing configuration with Platter Mats.
All my Platter Mat Trials have been carried out using different materials / weights to see how the permutation impacts on sound being produced from using the entire assembly of Mat - Vinyl - Spindle Weight.
Today I view using a weight, from my own personal perspective, as the weight having an impact on the finest of details from the recording being enabled to be presented.
The weight can have a subtle effect on the removal of smearing and when correctly chosen with the correct platter mat, will eke out the detail to be a little more resolved.
The weight I am most impressed by on my system in my listening environment is a 1Kg Composite design. I am soon to take this composite design little further and substitute one material with Panzerholz.
A Panzerholz only weight not at 1Kg, will also be available to compare.
The design I have in mind, which seemingly works already, as a result of one material in the composite being under load, will be to have P'holz under load.
Nothing Ventured - Nothing Gained