30-03-2020, 09:30 AM
Hi Mark, when I look at your photo it looks like the gaps between the segments of the commutator where the windings are soldered to it are not clean. This could cause short circuits within the windings. it would do no harm to clean these out (and the gaps on the rest of the com) with a narrow sharp tool such as a pointed knife used upside down so that the sharp edge is facing upwards.
John Mason
John Mason
Would you believe it "Her who must be obeyed" refers to my Ruby as the toy.