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A little tip about using the flat screwdriver type of adjustments that are metal screws as in trimmer caps and radio IF cans that use a variable capacitor. You can use a regular metal screwdriver, with the power off, first to free up the screw. The plastic tool blades will be chewed up by a stuck screw.
Sometimes the hex core slugs will be a bit stuck also and occasionally the manufacturer put a bit of wax or similar to hold the slug in place after they adjusted them. CAREFULLY using an Allen wrench first, again power off, might work. Be aware that some coils have mechanical stops at the ends of the adjustment range.
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