Usually, to make a loop on the wire to connect to the switch or outlet that electricians use pliers. Two
pins Ø 4 mm, installed in front of the handle of a screwdriver, can successfully replace them.
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You can, of course, brush them, however this will not last long. More radical means of plastic washer embedded between the half-loops. There is another way to get rid of the squeak....
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Hang a hook or bracket to a hollow wall (for example, sheathed with plastic or plywood) is always a problem: fixture does not hold in this place is quickly loosened and popping up....
