The wiring on my motor is just like new, as are the rubber grommets. I have to get my ear about three inches from the table to hear the motor running. I thoroughly oiled the motor with Mobil 1 5W-20 fully synthetic oil. It was dry when I got it. Probably never oiled at all before this. I suspect the rubber O-ring idler wheel I had made is quieter than the harder rubber of the stock wheel. This may contribute to the quietness, as I can't hear any change in sound from engaging the motor and having it run without being engaged. The table actually is a bit quieter than my old AR-XA belt drive. Quite amazing, actually!
If you look close at the pictures on my yahoo photos site, you'll see the round cut-out on the backside of the plinth. This has a removable round mounting plate for just as you suggested. I'm using a thick Denon hard rubber platter mat which does a great job damping the platter.

Dave