1/2 Masterforce Hammer drill losing power

SDE

Well-known Member
I took the drill apart. The part that the brushes push against (commutator?) was dirty. I cleaned the brushes and that other surface with 320 sandpaper and cleaned them with Lacquer thinner. I re-assembled the drill and after a few minutes of operation, it quit again. The commutator was black again. Are the brushes shot? What next?
thank you
SDE
 

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