This happened to me a few years ago they would just stop completely..What i did was to remove one of the motor screws and remove a little plate/washer..(I"ll have a look tomorrow to make sure) This gave an entry point to the motor and i soaked the armature with brake cleaner spray..(nothing oily as this will ruin the brushes..brake disc cleaner spray is so pure that it dries very quickly..to cut a long story short it worked a treat and been fine ever since..you may want to try this on the motor that you have lying around..regards hj.
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