Nedd cheap(er) panel mount optical encoders

Hi folks,

I'm having to repair a device that has six 1000ppr panel-mount optical
quadrature encoders. The encoders are failing more and more because the
device is a box which gets dropped on concrete floor a bit too often.

I'm looking for replacement encoders but at that resolution (500ppr would
do, too) things get really industrial-grade and ball-beared with
associated cost ($100+ apiece). The encoders are hand-operated with knobs
so precision is not an issue.

Suggestions, anyone?

bob


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