Try the site above for the belt. It's a nice website.
I have never had to remove a stuck platter, but most threads advise to gently tap around the perimeter of the platter with a rubber mallet to break the seal. After a few taps around try to pull straight up nice and easy.
This is NOT good advice. Rubber mallets are totally useless as they have rebound and are far too big for this kind of job.
Also, NEVER tap on the platter's periphery as you may buckle it.
The correct method is to tap on the spindle crown with either a very small plastic mallet or a block of hardwood WHILE LIFTING UPWARDS WITH YOUR FINGERS UNDER THE PLATTER RIM.