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If that's the case it could have been re-covered due to HV breakdown of the original tire, they sometimes become conductive due to attracting dust and other things which then cause carbon tracking-so carefully cut the old boot away and replace it with silicone. If the new coating has any pinholes you can then get some stray voltage which leaks out, heating up anything it makes contact with. If you also smell ozone, it's a good clue you have leakage. Shango did a video showing fly tire leakage, you can probe around it with an insulated screwdriver looking/listening for HV then plug the holes with more silicone.
I have a spare fly that I peeled the tire off of because it was all nasty, just haven't coated it yet. Maybe I should run it sans tire a little first, or bake it in a low temp oven to drive the moisture out.
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Evolution...
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