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Hi Damien,
I have had the same idea in the back of my mind for a while - a simple height adjustable pier for visual observations would work well at public viewing sessions etc.
My thoughts have centered around adapting the lifting and clamping mechanism from a medium/large sized drill press to create something like a rotary clothes line lift. Older type drill presses have quite fine tolerances in their engineering and I think it could be made quite stable for visual work. I have a workshop at home, so the adaption should not cost much.
I am on the lookout for a suitable old drill press at the moment - they go quite cheaply if the motor is broken down.
This might trigger some other "left field" solutions for you.
Cheers
Steve.
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