Also what does everyone use to clean com grooves.I always just ran a sharp needle or pin through them.
You really don't want to use anything that's tapered or comes to a point.
You won't be able to clean out the bottom corners , or it will take more effort.
If you're dealing with a slot that might have a bit of epoxy in there, an X-Acto #11, Dremeled to the profile of a slot, works well.
If you raise a burr, so what, it will quickly arc away in break-in.
On my own arms, that had been run a few times, I would use a pc. of .010" Lexan®, and also, if ambitious, also do the cleaning under a microscope.
All a bit of overkill, as if there was a pc. of copper still in the slot, you will know it as the arm won't spin freely when assembling the motor, before installing the brushes and springs.
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