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Golden Rule on the old X series motors keep the com clean. I spent many an happy hour repairing these motors which if looked after are good and will last for ever

1. Give the commutator a good clean , ensure all the oil is off
2. Clean gently between the segments ( a small pin is preferable but gently)
3. Lastly a little trick... reduce the spring pressure as light as possible so it literally just touches ( reduces friction) I have seen many where the owners have bend these nearly straight to increase the pressure!

It will take some revs for the brushes to re bed in but if it was OK before you changes the brushes the clean and lighter pressure should cure all
 
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