Paul,

Torsion plate connection, Milo


That is what Ross used. Ken Welter destroyed a couple of them. With a belt no less.
Springs don't damp. That is why cars have shock absorbers.

Here is my suggestion. Use silicon rubber. It is tough as nails  and is high temp.
Comes in a tube at the hardware store or you can buy it at MacMaster in cured sheet
form.

Absorb that torsional vibration in the form of heat.

Paul Lamar

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