Are vibration dampeners normally used with belt drives?  Would they
be similar to Tracy's?  I have heard it said the belts naturally
absorb vibration but I am skeptical.   Paul,  in your spare time how
about knocking out a set of  belt drive plans--just to show what is
required.    :)    Jerry

I think you need one. Some of the coolest are found in the hubs
of off road motocross motor bikes. Here are some pictures.