Mount Idea

[Mekon]

This might not appear relevant here, But thinking out of the box, look how they fixed this to the ground. A modification of this idea, might make an excellent pier for your back yard.

https://www.youtube.com/watch?v=9OFJgsEzEZs

[xelasnave]

Yes but cows rubbing on it would jiggle your scope.
Did something similar for the cat by fixing four scrubbing brushes to a pole and he loves it.
I think it probably would work rather well for a pier.
Thanks for posting.
Alex