I think in the designs used the extended threaded tensioner part goes right through the plastic into the mount so the plastic is only in compression.
That was my plan for a 200 water pipe pier with 20mm plastic caps. Full height Threaded rods all round like drum and a metal pier cap as you say.
I imagine a small alloy block bolted onto the cap would be sufficient for an adjustment post or a big tube nut such as I use on my pier.
Quote:
Originally Posted by Saturnine
I would assume that ,though the tube of the extension may be high impact plastic the base and the top cap would be metal, either aluminium or steel. May be possible to get away with using Delrin but for threaded parts and the azimuth pole metal would be preferable , to me at least.
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