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Might be easier to keep an eye out at auctions for the base of an old drafting machine (typically a cast-iron column with generous proportions) or a stand for hospital medical gear.
Back in the 1980's I scored two superb piers for scopes this way. One had a motorised height adjustment with a 4" central stainless steel pipe, the other was on huge ball-bearing casters that allowed it to be wheeled around easily even with 200kg load on top.
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