I use break cleaner - it'll evaporate long before it ever causes an fire trouble.
But - I also like to scrape out the area between the copper pads on the commutator. (if you've got it all apart anyways).
Those little slots usually get filled with non-conductive crud - but sometimes when something goes wrong in a motor like that, it can kick up a lot of copper dust and that also gets packed in there.
Just use a toothpick or something to clean the grooves so you're sure that each "pad" is electrically isolated.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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