Re: Magic Stick
Those were always known as "tuning wands" in my day. Brass one end {to act as a shorted turn and lower the inductance), ferrite the other end (to increase the inductance).
You don't need much of either to get a noticeable effect!
Reminds me of another 'tweak' I came across some years back - to increase the inductance of a coil, wind a bit of recording-tape round it! This has more than once been used here to add a smidgin of needed extra ""L" to bring to resonance an IF coil whose slug has been cracked/wedged by the Phantom Twiddler.
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