I need help with my Q1b. I believe it is a Q1b as that was what I was told when I bought it. Although I do not have the nameplate. It has a grinding/drag with the rotor to the housing. I have took apart the brass clutch and cleaned everything. I tried sanding to smooth out the housing. It got better but not all the way gone. If you look at the gap between the housing and the rotor is normal. Until this one part of the rotor meets this one part of the housing. It starts to rub right there. I can see the tolerance get smaller and smaller until it starts to rub. Like I said the sanding did not fix it. Any ideas?