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I used a place at Edwardstown named metal fabricators. I have used them several times now and they make good piers. Use an 8" pipe with gussests (4) and that should get you there.
For the concrete get some mesh and tie that together in a cube about 100mm short of the actual hole all the way around. Put it up on some small blocks in the hole and you are there. Then just dynabolt the pier down. Making sure the bottom of the pier has a nice wide base plate.
Once you have that setup you can forget about movement forever.
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