Hi from retired Englishman in SW France @ 16:04 Tues afternoon.
Sorry but you may not like this answer!
I strongly recommend changing the motor. If you manage to change the brushes in the motor they might last only a short while- maybe months- because they will not seat properly on the motor commutator- not unless a lot of skilled work is carried out on the commutator.
I know motors are expensive but this is my best solution.
Good luck
John C
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