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In October 2008 we bought an Astro-Physics 1200 mount to replace the Losmandy G-11. This page shows how we installed the AP1200 on the concrete pier in our observatory.
The Astro-Physics 10" standard pier adapter (SPA) is large enough to span the four ½" bolts protruding from the top of the concrete pier. I drilled and tapped a ¼"-20 hole in the end of each bolt, then drilled and counterbored four holes in the SPA for ¼" cap screws. The cap screws fasten the SPA securely to the top the four bolts, and the nuts serve as a leveling adjustment for the SPA. I used a machinist's bubble level to adjust the SPA to within 8.6 arcsec of level (1 division on this level equals 1.4 arcmin, and I got the bubble to within 1/10 division).
The AP1200 attached to the pier adapter installed on the concrete pier.
