What is this masterpiece.
You will find attached a kind of brush in order to suppress the vibration of the belt.
It is an effective way and very primitive.
But I think this, and is expendable, what did you have stock as maintenance parts ...? http://www.kantama.com/annex/vx2000/stabiliser.jpghttp://translate.googleusercontent.com/translate_c?depth=1&hl=bg&rurl=translate.google.bg&sl=ja&tl=en&u=http://www.kantama.com/annex/vx2000/vx2000.htm&usg=ALkJrhjwl43bMHHvUMMR8Lol3_ftyKbrBAhttp://www.kantama.com/annex/vx2000/driveunit1.jpg

What is it?

a kind of very primitive brush,approved for mass production...on panasonic/national/vcr hehe

Simplicity is the ultimate sophistication. I believe that was a Leonardo DaVinci quote originally, later used by Apple.