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Here is my obs permanent pier that I constructed nearly a year ago now, with some help I should say!
I used 220 mm OD with 1 inch wall thickness and 1.7m high.
The pier was placed on a cubic meter of concrete with a 12 mm base plate.
A mount adapter plate with 3 support bolts was also fabricated using aluminium for the support plate and saddle plate and S/steel and bronze aluminium for the support bolts with 1mm thread.
Here are some pics:
Wizzy!
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