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Hi, just thinking loud, but is the open winding layer wound or wave wound?
If it's layer wound, what about careful stripping of the bad winding, counting turns between taps and marking their location, then a good rewind with new magnet wire of the correct gauge #? It is not simple, but not impossible either, it just takes lots of time and patience, and if a replacement is unavailable, this may be the only solution. If you follow this route, don't forget to impregnate the winding with abundant anticorona lacquer, as the interlayer paper alone is not enough insulation.
Cheers
Giulio Maiocco
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