Hi: You could also use the toothed belt (or, better yet, 2 belts, one on
each side) in more normal fashion, running over 2 pulleys with the belt
attached to the moving part of the camera. Turn a knob fastened to the
pulley and voila! Of course, the belts have to be long enough for the
purpose which means you'll have to find a couple of the very old
wide-format daisy wheel printers to cannibalize 'cos my Canon 11 X 17
inkjet printer is right out of bounds! Brass racks and pinions are much
easier and, in the long run, very cost effective.
bye, sid.
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