Here it is… same material / concept as bottle brush style cylinder hones. It takes a bit of time to get a nice, uniform cross hatch but works quite well. Came from the days when I would prep auto rotors for new pads. Just chuck it in your drill and go at it at low speed (I think to minimize wear of the stones and perhaps to control cutting action. If you ran it too fast the surface may be too smooth?
I think if you chucked the rotor in a lathe and turned it at a snails pace, you could get a nice, very uniform pattern. Btw these rotors are SS and trying to scuff them up with emery cloth is not easy. 3 stone grits available. Mine is medium - 120 grit.
Thx for the tip. I’m trying to reuse the tube so this may be risky on this job. I have cut off both bike and car tires before making it much easier. On my car, I had to remove run flat tires that tire shops weren’t able to take off. The short, very thick sidewalls made it next to impossible to get them off. On those tires I had to use and angle grinder with a zip cut wheel.
