[bruce750i]

Dermil with the cut off wheel & sanding drum, motor in a mount, heat shrink tube cut short and layered up a bunch on the shaft to cover the bearing, magnet, zip lock, set transmitter end point to med-slow motor rpms. I used a 4s for grinding power but 2s,3s would have safer no load rpms. Zip lock did kind of suck, it would grab and try to twist up around the shaft, unless the hole was to big to do much anyways, but it kept the dust of the rest of this beastly motor. Then just stroke the shaft nice and easy. I held the cut off wheel rotated about 30* from axis of the rotating shaft to help maintain squareness.