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I have a single 4" concete floor for my observatory, with the pier bolted to it. The problem is the concreate sits on ground. Where i live, there is black soil that moves with the weather, eg wet / dry. I have a high quality bubble level on the the pier. In a week or two the pier moves. I need to constantly relevel the pier and adjust the polar alignment.
Since I am only in the observatory to setup / packup and image remotely, moving around in the observatory is not an issue.
Brendan
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