Review on UAC SW 0561C Clutch Switch by Steve Hauck

I bought another switch after returning one of these and it still leaks - the original switch is sealed when hand tightened. I got the calipers out and found that the internal size of the new derailleur was slightly larger, which could have been due to trying to reuse the original o-ring. Also, I noticed that the new switch turns on the Schrader valve a few turns earlier than the old one. Edit - I bought a set of o-rings and selected one that was slightly larger than the original one - now it seals almost instantly rather than leaking for a few seconds while the switch is being screwed in.