Classic 3 VPI

two belts sure helps, as mentioned above

lenmc - u need to check ur rega table pulley - does it have grooves for more than one belt?

on the vpi classic 3 the pulleys have grooves for 3 belts

If you are planning on using more than 1 belt on your Classic turntable, make sure that you have the correct non-stepped pulley often referred to as a HRX pulley. 

My 4 year old Classic has squealed since day 1. 

I dont hear this quirk as a real concern. A few seconds of belt slippage and its fine.If your running your table straight, the platter speed  by default, is off. This is only an issue however, for the obsessive hobbyists like many of us here.

Since it isn't an issue once up to speed, I'd be more concerned with speed stability via SDS/ADA or Phoenix RoadRunner.

pbnaudio,

The use of multiple belts would seem, on it's face, to not be a good idea. Connecting the motor to the platter more, thus transferring the vibrations?

Since the Classic 3 has an on-board motor, this may not be an issue and in fact help to dampen the motor vibrations?

Have you actually tested this in some way or is this based on listening? Thanks.