Professional Magician - Magnet Implant

I would be seeking another installer or 2nd opinion, I respect their honesty, but it can and has been done.
Not reccomended, but it is your body.

Just FYI, There are now other magnets on offer that may be better suited.

Here are some discussions

Also, have a look at reed switch or hall sensors, these shoukd open up a lot of other tricks for you

Also some learning that may help

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