The new pier adapter rotates on a bearing surface for ultra-smooth operation. This allows you to lock the mount down with no need to loosen the base during azimuth adjustment. This option is especially recommended for use in the field. You may wish to purchase two or more of these assemblies to install on separate piers.  Perhaps you have a permanent observatory and a portable pier for traveling to dark sky sites. The Standard 1200 Pier Adapter (1200SPA) is another option to consider.

The Rotating Pier Adapter includes two machined plates, four machined aluminum lock knobs with 5/16 x 1.5"OD flat washers, azimuth adjuster block, six 5/16-18 x 5/8" socket buttonhead screws and 5/16 x 9/16"OD x 0.060" flat washers. All machined parts are black anodized and the fasteners are stainless steel. This adapter will mount directly into an Astro-Physics Portable Pier. If you plan to use an ATS Pier, the O.D. of the plate will bemodified by ATS for an additional charge.