Here's a link to something about getting the angle of attack on the paper wheels:
http://users.ameritech.net/knives/electric.htm
If you happen to have a table saw, band saw or router table, you can bang out 8" disc's all day for close to nothing using 3/4" MDF scraps that you can get from either the big box stores or even free from kitchen remodelers. Just rough cut out a piece slightly larger than 8" drill a hole in the center, use a carriage bolt to mount it to another long piece of wood, clamp it to your saw or router table and turn the MDF into the blade. You'll end up with a nice clean circle.
Richard: If you're lurking, Thanks for the vid clips!