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What tool for pot nut?
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helius:
A tool for a pot nut would obviously be a roach clip...
bob91343:
I have encountered this many times.  I do recall at a camera repair class that the instructor suggested a Crescent 777 pliers with tips modified to have a gap when closed.

One way is to find a pair of pliers that has tips closely matching the width of the slots.  Another is to use a small screwdriver that you lay into one of the slots and tap with a light hammer in a direction so as to turn it counterclockwise.

One of these schemes has always worked for me.
tooki:
FYI, these things are also used on many panel-mount safety banana sockets. Depending on the diameter, one of their tools might work. I’d check out some banana manufacturers.
Benta:
The search term is "round slotted nut" or "slotted round nut". Tools are available but hard to find.

The best homebrew solution is a piece of steel tube with the same diameter as the nut, with the end filed/milled/ground down so that two tangs fitting the nut remain.

Cerebus:
The classic quick workaround for this for this is to make yourself a tool out of a short length of steel pipe that's roughly the right diameter. Just file down the end straight across (i.e. on a chord) the whole width of the pipe on both sides to leave a couple of 'nibs' sticking up that are the right size to fit into the slots on the nut. Crossdrill a hole in the other end of the pipe that's the right size to slip a screwdriver through to use as a lever. Takes 10-15 minutes if you've got a sharp file and a suitable bit of scrap pipe handy. If you can find a box wrench roughly the right size you could file it out of that.

The finished tool would look something like the tool top right here:

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