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Title: they don't work if you need to keep the switch ON
Review: These things seem like a good idea, but in practice they allow a tiny bit of movement of the switch, and in many cases that is more than enough to break the circuit long.These would probably work great at preventing someone from turning on a switch, but as for preventing the interruption of power by keeping a switch ON, they fail.For that matter, these might even be dangerous for this purpose since they allow just enough movement to break the circuit, but not by enough that the electricity cannot spark over the gap.And sparks inside the wall can be a very bad thing.
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