>Greyhill make optical ones, Alps mechanical ones, that are sealed. A
>mouse based one does work, but  easily upset by dust and a  lot of work
>mechanically.

I have good experience with Grayhill, I used their switches in one of my 
projects and they were very helpful - it would probably be worth contacting 
them (or Alps, or Knitter-Switch) and asking their advice. A hermetically 
sealed version as mentioned sounds like a good idea. 


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