Thanks to all who responded to my plea for help on cutting glass. I'm still trying. Now I think perhaps my wheel might be damaged. How would one know? I was just getting the hang of it and scoring some nice pieces while practicing, when one piece broke and micro shards went scattering. Now I think perhaps my wheel has some shards in it, because it sounds terribly gritty and sandy and I'm not even putting a lot of pressure on it. Is there any way to clean it? It's a self-oiling one. Also, it drips oil - can you have too much oil on the wheel? Thanks again EVERYONE for your replies as I learn to frame (will I ever make $ doing this???) YIKES!