If all you need are new brushes, have you checked at a electrical supply store for same size brushes from a different motor rebuild kit?

I used to get all kinds of stuff from places like that when I was in CONUS.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course