Re: Potentiometer
Use a multimeter to work out which switch contacts are connected together when the switch is ON, and use one pair for the live. If you are not switching the neutral (there's no reason to, in the UK, and it's actually very slightly safer not to; although it makes about as much difference in real life as crossing the road to avoid breathing in the smoke from someone else's cigarette) just use either of the two pairs which are connected together when the switch is ON.
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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