I too believe that you starter is OK.
The comutater is used like a rotary switch to apply battery current to the
proper winding at the proper time. As the armature turns the brushes
contact a diferent segment of the comuatator. This make for a great DC
motor, although a high current level is running through the carbon brushes
to the comutator segments.
Any dirt or grit that is on the comutator is a bad thing but not a really
bad thing. Make sure that you have not left any wire brush bits inside
the motor and give it a blow-out with compressed air and move on with your
car project.
Tom Howard
Lakeside Union School District
('72 Triumph GT6, and a good bit of USA iron)
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