I looked at several of the mod videos you linked. The only one I watched that shows the enlarged pulley, he puts very little pressure on the belt with the knife. To grind a bevel, you need a ton more pressure on the belt then what he is doing. I guarantee I could get that belt to stop, and without working very hard, certainly not at the pressure I grind at (and It's less than most other makers apply). I'm not trying to argue with you, it seems like you are set on getting that machine. I wouldn't say it's a waste, as you will likely use it for other projects. I just know how expectations can be dashed by reality on this stuff. like I said, I started out with stuff like this as well.