> It's annoying as I have definitely seen them in products before,
> but nobody seems to know where to source them

Omron B3SN range ?

http://home.eu.omron.com/europe/www/cncweb.nsf/d9d48916a4b384d8c12565050025e194/1577a2aefd082dd141256707005756ff/$FILE/B3SN.pdf

Sorry for wrapping URL, but can't see where to shorten it. 

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