I don't use a platform of any kind. My stand is a Billy Bags audio rack. Welded, single piece construction, and rock solid. I have tried some felt, and some furniture slides under the motor. Both help, but they don't come close to the speed stability I get with the belts. Do you use a KAB speed strobe, too? Is your speed dead solid 33?
It would be nice if I could check out someone else's system and compare. Any one else running the flywheel upgrade in Chicago?
Stringreen, when you put your ear right next to the flywheel, can you hear any contact noise between the flywheel O-ring belt and the platter? I sure can. It's a "scrape, scrape, scrape" kind of noise that occurs once every revolution of the flywheel, when the area of the belt with the slight bulge to it contacts the platter. And if I press my finger in between the motor assembly and the TT plinth, I can feel the motor assembly rocking back and forth. Granted, it's a VERY slight rocking, but that rocking will surely transmit far more vibration to the table than a belt hooked to a motor flywheel...
Thanks again for the help.
Tom