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.
Updated 12/27/13
