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 Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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