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Just an idea, but for my pier I built a round tube of decking timber I had lying around. I screwed the timber onto 2 metal bands on the inside, one at the top and another at the bottom, and formed a tube that way. The inside diameter is around 30 cm. And then I filled it up with concrete. It didn't have to be watertight since the concrete doesn't really ooze out unless there is a significant gap.
This was built on top of a proper concrete base into the ground.
It was very simple and yet very decorative in the end, since I could stain the timber. I'm very happy with its performance and it looks great. I would post some pictures of it but they are on another computer. If anyone is interested then I'd be happy to post the pics later.
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