Next time you get some take at least a medium size one and look at it good, see if you can figure out a way of breaking it down relatively easily to get clean copper. I had some wound motors that had a coat of varnish on them and the strings that I thought would make them a pain to break down, so I sold them as electric motors. After a while I took one and studied it, figured out a way of getting the string off and the copper removed, and now no longer put them in the motor pile.
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