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Greg,
I also used 275 OD x 6 (or 7?) mm wall thickness pipe (cost $5 scrap) and it's just over 1 metre tall with a 12 mm disk welded as a base - no gussets though. It is attached via 8 bolts to the top of my 2 metre tall concrete pier (457 mm dia). The whole job is very solid and I'm sure that you will find the same.
Cheers,
Chris
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