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Author Message   John_shriver Tinkerer Username: John_shriver Post Number: 13 Registered: 12-2006 Rating: N/A Votes: 0 Posted on Monday, May 14, 2007 - 06:50 pm:    I think some of the old wires from battery compartments had polyvinyl chloride insulation, which breaks down to form hydrochloric acid. I think that's what ate all the black wire in my Topcon RE200. As for soldering, I'd start with a thermostatic iron with a low temperature setting, like 500 Fahrenheit. Also a eutectic 63/37 solder. Stripping thin magnet wire, yeah paint stripper is pretty good.