...if they do not start properly, and it may be a bit juddery for a very short time if there were and particles left on the motor just to clean them off.that should solve your prob, if not then check ...
...or similar, be careful not to damage them, as they are out use a Hoover to suck out any dust particles out of the motor housings, just put the tube over the holes you removed the brushes from ...
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