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Thanks Pete and thanks Al.
I have decided today to go with a steel one. It will need to be about 1500mm long MAX which puts about 1000mm above the floor and something like 400mm to 500mm below as Im building on slightly sloping ground. By the look of Als figures if I opt for something say 150mm-200mm in diameter and about 10mm thick as I can get that kind of stuff for nothing from a mate. I dont want to go too big and have problems with the camera snagging on anything going thru the zenith.
Will post pictures like everyone does during construction .. so lookout for those.
Thanks again
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