Hello, these belts (O-rings really) can be purchased off ebay for a few dollars or you can take it to Ace or True value hardware and they can make you one. You need to remove the Goop aka former belt first. I would highly suggest disposable gloves a small dental pick and lots of rubbing achohol. Be patient it will take a bit to get it all off. Go ahead and clean the old grease off the gears while you are in there and re-lube it with silicone lube. It will run much quiter and stable that way.
Mark
www.8mm4u.com, February 2009