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Hello there! <br />I suggest that you try to clean the brushes and the collector on the rotor first - the collector consists of five (more likely in new models) or three metal parts - depending on how many poles the motor has - forming a "ring", and the brushes slide on the collector. Sometimes the grease, oil, dust and carbon particles coming off of the brushes can fill the little grooves on the collector and cause the motor to short circuit. You can carefully clean those grooves with a needle - avoid scratching the collector, and fini***he cleaning with alcohol. If that doesn't help, judging by the symptoms most probably one of the poles of the rotor is burned, in which case you need a new rotor. <br />Just go slowly and patiently. Good luck & best regards from Croatia! <br />Oliver.
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