I just found this website:
http://www.photofab.co.uk/index.php/products/optical-encoder-discs-and-actuators/

I don't know what the pricing would be like, but that could be a
perfect way to add a spindle encoder, if combined with
http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=1711830
or
http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=0196987
(I also found a tiny surface-mount one a while ago, but can't see it now)

-- 
atp
"Torque wrenches are for the obedience of fools and the guidance of wise men"

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