Nottingham Owners - Please Help

I have a Nottingham Interspace with a Spacedeck platter. When I first got it (a dealer demo), the motor was generating significant mechanical noise that was audible standing in front of the turntable as well as being carried through to my speakers. Nottingham happily sent me a replacement motor. The new motor is much quieter. However, in between tracks (when there is no music) the same mechanical noise (like a rotating motor) is still somewhat audible. Once the music starts, you can't hear it so there is no real impact to the listening experience. However, for a table of this quality it bugs me knowing that it is there. Has anyone else had a similar experience?

PS (1) I know the noise comes from the motor because I've removed the motor from the table and plugged it in and from the motor the noise eminates. So the problem has nothing to do with the belt or platter.

(2) I know that the motor is supposed to vibrate when not spinning. That is not the problem here as the noise is only heard when the motor is spinning.

Thanks,

Mark