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I was able to repair the wirewound bias pot on a Hickok 539B tube tester using the conductive paint from an automotive defroster repair kit. In my case I was able to remove the WW element from the pot case and flip it over so that the wiper now rubs on the unused edge. I used an ohm meter to find the three open sections and carefully used the paint to bridge the gap on the edge where the wiper originally contacted the wire. That was a year ago and the tester is still working fine.
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