I have a TTW GemV2 with a 42 pound copper platter. This was a demo unit. I did get a brand new momentus motor and speed control.
if the motor pod is set too tight to the platter you will get motor vibration. tap it out a bit just so it drives the platter. try and dress the oring with 1000 ,1500 grit emery paper. the more accurate the diameter, the more accurate and consistent the speed will be. make sure the pulley is locked tight to the motor shaft, any wobble there will cause improper speed.
I actually changed the drive unit to the Teres Verus pod and controller One of the best things I did for this table.
So here is a cheap tweak :)
The Teres uses two little pads set off the centerline under the motor pod. this allows the pod to lean into the platter using gravity to maintain an even consistent pressure. dressing the oring is much simplified as you just stick the emery between the platter and drive pulley, letting gravity apply the pressure. this results in accurate and consistant speed with all the goodness that comes from that.
Using the same principle of the Teres motor pod, I used 2 kitchen cabinet snubbers, those half moon stickon things you will find on most cabinet doors to cushion the impact of door to frame, just off the center line of the pod and let the pod lean into the platter, like the Teres system.
More accurate and consistent speed control with simplified oring dressing.....sweet !
Now you do say "orings..does this mean you have the double oring spindle", or is it single ? mine is single, so the tweak is easy. with the double it would be slightly harder, but still worth it to try .
Ron