Thanks Ken and Joshua for your input.
My plan is to bolt the adapter to the mount head first and then bolt the entire assembly to the pier.
As the adapter and mount effectively becomes one unit, I am looking at cutting slots to the top plate of the pier, which allows for some az movement. I hope that makes sense. I will do some drawings and post it up later to gauge further opinions.
If this approach does not work, I will look into the pier extension which allows for az adjustment as ken mentioned below, and allows for under mounting of the head.
Thanks
Bo
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