One other point, your pier, concrete or steel, will be a condensation magnet that can mean your mount head sweats as a result. The pier cools the mount head. In winter I have a mount head shroud that i made that has a small light bulb inside, this protects the mount head from condensation buildup. If you live in a high humidity environment it could be essential. If a mount is sweating or condensing on the outside, there is a good chance it is inside as well.
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