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Just to add to what rush15 has put, depending on the turn of your motor, the commutator will need what is known as "skimming" every so often.
This is where the armature is put on a special lathe, and the comm cut by a diamond tip to get it true again. Most Model Shops will own their own lathe and will charge you a small fee for skimming. However, it is well worth it because, even though you are taking material off the comm, the motor will last longer if skimmed regularly because there will be less overall wear.
It's also a good idea to replace the brushes at the same time as having a skim, that way your motor will be as good as new.
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