Thoughts On Turntable Clamps And Weights

Never used a clamp, but I can tell you that a weigh made of brass or any Non Ferrous metal or even marble makes a very noticeable difference.

All the Best.

If a stator bowl is what I think it is, you may as well redesign and replace the whole motor. And once you’ve done that, you need to address the function of any speed control mechanism. If you go deeply into that area, you may succeed in never having a functional turntable, as one problem leads to another.

Well said. A synchronous AC motor is a safer bet, so a good first step.

@bolong Indeed an elegant solution that adds $5,000.00 to the cost of a $22,000.00 turntable available for purchase on both coasts of the US of A. 
See https://almaaudio.com/ for Bergman Audio products to include the Bergman-Galder turntable with vacuum clamp. Tone arms sold separately, but you can mount four (4) of them on the table. They have dealers all over the world  https://bergmannaudio.com

A record weight or clamp should damp spurious vibrations, not try to flatten a warped disc. Have a look at the Origin Live Record Weight - The Gravity One.