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Hey Striker,
When we built our pier it was a galvanised steel pipe about 5 inch diameter and 4.6 metres long. it was chosen as it fitted our C14 Losmandy mount.
It was concreted into the ground to a depth of 3 metres using 1 cubic metre of concrete. The pipe was then filled with concrete also. It still wobbled. In the end we had to put a casing around the pipe and fill that with concrete also. After that, no more shakes. here is a pic of the final result.
Mike
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