the stainless steel part came from another project I had a few years ago and since I already have it I will use it. Yep the screws do hold the bottom plate on the extension, but that allows access to the screw thread and knob on the inside to attach the mount head to it. the pole is 100mm with a wall thickness of 4mm, thicker than the pier mount attachment. I will be of course cutting the pole if to suit but at this stage I am trying to work out the best possible combination to achieve the goal. if I had fins on the exterior to the pole would that stabilise it?
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