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I poured my footing, hand mixed from Bunnings concrete bags, complete with rebar. You need to work quick, wet on wet. And my pier, is also concrete, and part of the contiguous pouring into the footing just as soon as it would support the form tube weight, used a big plastic pipe for the form, with reo down into the footing and galvanised L bolts placed in the top.
The problem I see with buying a big cement block is how the heck do you transport it and get in into a hole. Bags of concrete are easy to transport and move.
Which ever way be prepared to be sore for days, unless you hire someone to do it.
I also dug (by hand) my observatory footings.
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