The point being that it probably OS alreadyy pulled downward and some can be removed.
You need a bloody accurate frequency monitor to set these up. Id suggest a new movement frankly - cheap as chips mostly and standard.
Original manufacturers may supply as well.
How about a Braille picture generator? I think it would have to be black and white only.
By coincidence there's a similar question in this week's New Scientist
The complete answer (which you can't see without a subscription login) suggests that if the clock uses mains frequency for timing, this is very easily upset by noise, typically from a dimmer switch. That would explain why - in this case - any clock plugged into this particular socket wouldn't keep time.
IIRC, the solo circumnavigator Joshua Slocum, in the eighteen-nineties, used to boil his alarm clock from time to time. . .
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