Summary
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Many astronomy applications require a very strong, very rigid pier system, but others do not. While a strong, rigid pier is easy to construct in an on-the-ground observatory, it may be very difficult for an on-house installation. However, even on a house, it may be feasible to use the existing structure to support both the observing floor and the pier. It is also feasible to construct isolated piers, even on the upper floors of homes.

You can have a local machine shop construct the pier and pier head, or you can find the material and do it yourself, without special tools, and at low expense.