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 Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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