I have done a test fit up of my C11 + M102 on my EQ6 today using an ADM side by side bar.. Took 4 counterweights to balance it, and as peter said, the large scope sits ever so slightly off center of the mount, as the guide scopes weight is pretty minimal compared to that of the C11.
mounting guide scopes on top of the primary imaging scope can cause flexture problems with heavier ota's, which only leads to headaches and hysteria...
Also, guidescope rings are a must, My ST80 is in a set of ADM 100mm guide scope rings and will likely be used as the guide scope more than the M102.. Weight is a problem!!
