Thanks Joe, I think I know someone with a solder iron.
I'll try smoothing out the rubber wheel. The bobbin bar actually swings the motor wheel away from the machine wheel so that's easy peasy. (Thanks Thayer Rags for that tip) I have a good heavy duty rasp with both flat & curved sides and different grades of roughness but that may chew it up so I'll try the sandpaper. I wanted to know about replacing one in case, I mess it up.
I wish I could put a sound bite up so you all could hear the noise my machine is making when it runs. It's deep, not actually grindy but seems to be under the machine. I'm going to try adjusting the feed dogs just a bit to see if it helps it run easier. I just have the feeling it's working harder than it needs to be. I think it will eventually be a really good FMQ machine. It's been cleaned & oiled & oiled. I've tried following the Muv videos and, of course, if it's not right, it's me not the videos.