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Graham,
How about three semicircular slotted holes instead of three threaded bolt holes
Just put a hole in the side of the pier so you can squeeze in a spanner in to hold the nuts
Or make the base plate more adjustable to it can rotate about the mounting bolts with either slots or simply large holes (probably easier to manage)
Or align your mount before attaching the pier to the ground, so the Az adjustment range is within the mounts capability.
Rally
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