Heating alone is only half the solution. You need to be able to dissolve the hardened wax. I use a squirt of WD40, wait overnight, and if it still will not turn, then hit it with heat gun and more WD40. Also, never use anything besides a plastic alignment tool. Allen wrenches are a sure way to crack the ferite core.
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Vacuum tubes are used in Wisconsin to help heat your house.
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