Re: Rewinding slug tuned IFTs
One other thing to consider - which I've done in the past - is wiring an additional coil in series [externally] to your variable one.
OK the tuning-range will be restricted so your choice of the additional coil's value needs to be made with intelligence - and it'll be unscreened - but the little axial-leaded coils that look like resistors are ideal for this sort of thing.
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