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Good advice Dave, 20 to 25mm should be enough thickness for the base, but the gussets will be needed to stop flex of the base plate.
Be aware though Clive (if I remember your name correctly, sorry) a 1.8m 250 NB pier, with 25mm thick 500x500 base, plus gussets and a top plate, all as one weldment will be around 200Kg.
Cheers,
Jason.
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