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So, posting in the hope of seeing what others have done in terms of reo and mounting bolts.
Unless someone says something otherwise I plan to build a rough cube of light reo mesh about 700 mm on a side. I reckon 12mm bolts should be plenty to attach the steel pier and I am going to weld them to a plate which in turn will be welded into the top of the reo cage. Then to pour the block I will make a timer frame that will screw to the boxing up for the pour and will support the reo cage via the mount bolts so it won't come out of the concrete anywhere except for the pier mount bolts. The hole has ended up just under a cubic meter, I ran into a rock in one corner so I am stopping there!
I am tossing up if I should use four bolts or three, three should provide plenty of strength and makes for far easier leveling via shims than four bolts do.
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