I don't have the engineering to quote the math of the flexion of a vertical pier under various conditions. I'd guess the taller and thinner, the greater the tendency to wobble about. Makes sense.
But with a tripod, with legs at full extension - say each point of the tripod being the corners of an equilateral triangle with each side about, say, 750mm and the whole being about 1200 above ground. I would have thought this would be very unlikely to produce wobbling even with a big newt on top. I would be tempted to also hang a substantial weight (like a deep cycle battery) from underneath the center bolt to further stabilize the thing - holding it down. It's these sorts of ideas that set me to wondering whether a reasonably good slab of say 100mm deep would suffice.
Peter
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