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Jjjnettie,
That may be OK for temporary permanent site :-)
You just drop the hardwood pier into the hole 30cm deep in the ground filled with concrete.
But you should expect it to change with time, it could twist and/or split... But for the type of setup you are using now it might be OK.
Just be sure to use old hardwood (already properly dried and completely dead and stable) and always keep it dry under the cover.
However, I would consider steel or plastic pipe filled with concrete, it is not complicated at all to do and you will be certain it won't move.
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