Last night I measured the motor housing; its diameter is about 3.5 inches. All the "dots" are much smaller. When I get around to this, I'll probably get a couple of grungebuster sheets.
Another question regarding this turntable. Its felt mat is very thin. I have a Way Excellent Mat I bought for my ancient AR. If I transfer the Way Excellent Mat to the Pro-Ject, do I need to fool with the Vertical Tracking Angle?