Hi Geoff
I don't know if this will help you or not, attached is a couple of photos of my 4" Tak mounted on a G-11 with an 80mm SW Pro Series as the guidescope.
All mounted on a 12" Casady tandem bar, 12" saddle and H/D BT Technologies dovetail for the Tak, Casady TGAD, Losmandy DUP, Parallax rings and 8" saddle for the 80mm.
An excellent and very stable imaging system.
Cheers
JohnG
PS: The SW ED80 is set like that to get at the finderscope.
