Re: Bush Dual standard chassis.
Seperating the overwind from the bobbin and the inner 625 tuning winding may seem quite drastic and would never have been done back in the day when replacement LOPT's were readily available. Different story now of course.
A supply of 2inch Kapton tape could be used to re-insulate the tuning winding. It may withstand the heat better than polythene tape, although my effort is still working well almost six years after doing it.
One thing to watch is that you maintain correct position and connection of the tuning winding upon re-assembly otherwise there will be no 625 line EHT.
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Andrew
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