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Thanks for all the tips.
I ended up going with Sirius Optics and Pegasus Piers. Aussie made, looks very professional, has slotted holes in the adapter plate, 6 holes in the base, gussets and is 275mm diameter (diameter of the pipe is the key to rigid piers per an engineering paper) with 7mm walls. Powder coated satin black. 1 metre tall.
I am going to anchor bolt it into a concrete pier which will be around 1 cubic metre. Then a 2nd flat pad for a portable pier I have that I am using now with an NJP mount on it.
Greg.
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