I want to permanently pier-mount my CGEM. What size is the hole on the head holding the central rod?
January 26, 2011
The CGEM’s equatorial head has a center flange 29.5 mm in diameter. It is centrally bored out with a threaded hole that is M12x1.75. The entrance to the hole is smooth and 13mm in diameter. On the tripod, the top plate has a central threaded hole that is M12 as well. The top plate has corresponding concentric cylindrical wells that are 30 mm and 65.5 mm in diameter to hold the head.