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Well done Wavy! Just looked up the clepsydra, but will try tangent arm style first (only because I have the "scrap" steel in stock). Failing that option, the clepsydra using the windmill pump to drive the rack in a slide, with a matching gear on the RA shaft (there are a fair few available cheaply). I don't really have to do it, but I'm bored and looking at building something with a novelty value!
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