Thanks for the link to the thread Lee - will check it this evening.
Yes, my OAG is fixed relative to the main camera, and to date I never had to rotate it due to the lack of suitable guide stars. After meridian flip I would select a different star because the camera is "upside-down" relative to its orientation prior to the flip, thus the OAG points at a different area near the main target.
I have a motorised rotator though - it is very convenient (and fun to use!) for planning the photograph and precisely orientating the camera
