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Hi all, I have a corridor with 3 pneumatic delay light switches. One of these keeps getting stuck (tried WD40 but didn't work) and I want to replace it with another delay switch, probably a motion sensor switch. I've done some research on this: - My understanding is that since there are...

Hi all, I have a pneumatic time delay switch in a communal corridor. It looks like this: http://www.screwfix.com/p/columbus-pneumatic-time-delay-switch/68088 When pressed, the round switch in the middle is meant to eventually pop out, turning the lights off again. But it keeps getting...