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Greg,
it is going to be better if you go to an engineering firm. My pier weighs in at a massive 150kgs and I bet if you kicked or punched it two things are certain. First you are going to brake bones and second it would not move a pixel.
Not to shift this thread to a pier strength one but I got 12mm wall at 200mm pipe with gussets and a huge flange plate at the bottom. It cost $700 and came with primer on it too.
Go with the local stuff.
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