> You can demagnetise parts easily.

I've just re-wired a couple of watch and tool demagnetisers. They
have a mains-charged cap that discharges through a large choke
when a momentary button switch is pushed, very effective pulse

> Why do you have to cut a hole in the speaker casing?

Looking through ?

What's got 50 legs and 8 teeth ?

Front row at a Willie Nelson concert

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