Turning down motor shaft

[simplechamp]

You could use a servo tester connected to the ESC to control the speed of the motor. But if you can get it working with the throttle trim on the radio, that's free!

Along with the plastic bag over the motor, maybe cut a piece of cardboard into a circle, and poke the shaft through it. It will spin with the shaft and be an extra shield for keeping metal filings out of the rotor bearing. And after you are done turning it down, don't forget to grind a flat on the shaft for the pinion set screw.