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If you're able to find the broke end of the fine wire, the old 'aspirin trick' might be useful in stripping it. Instead of scraping, a little puddle of molten aspirin does the trick. With a soldering iron, just melt an aspirin tablet on a tin can lid or something, and dip the end of the wire in it. Hot acetacylic acid does the stripping. Fumes are gawdawful however, so use plenty of ventilation.
(That other feller with the Coronado open oscillator coil might find this useful.)
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