I have a used starter motor that free spins at 9200 rpm (a good sign) but it is making an abnormal noise. Anyone ever take one apart and replace bearings/ brushes and grease it up? Links? pics? Source of parts?

I called a place that rebuilds starters and asked if they load test it after a rebuild. The answer was "no, there is no such thing since there are so many starters out there."

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked