Just looked at mine, yes over hangs the plinth by about a inch. Never really thought of it as a problem, I kind of like it for sylus cleaning.
The ball bearing tip is good. Also, try a better power cord on the motor controller. You'll be very surprised and happy. New belts seem to help it every year or two. I also have mine on a Symposium Ultra stand. It is sensative to what you place it on.
Good luck, great table !