I'm looking for the smallest mechanical encoder in existence that is
readily bought.
NOT one that is designed to be mounted onto motors like the one
micromo/faulhaber sells as 'world's smallest encoder.'
It would be for a small hand-turned knob to tell software what
position its being rotated.
The smallest I could find is this, but it is obsolete:
http://www.bourns.com/pdfs/3375_obsolete.pdf
Is there any at that size or smaller? Anything larger will not work.
The body has to be 6mm wide or less.