I will explore this -- was not familiar with it because the name seems to refer to using the airlons as both elevator and airlon, something I do with my Zagi.

BTW, I did adjust the arms on the servos and the control horns and came up with a close synchronization. We flew it this evening and I was not too dissapointed in the results -- more work is needed to refine the control.

Your suggestion about the servo arm being 90 degrees to the pushrod sounds promising -- got the same recommendation on another forum. Since my pushrods cross each other in an 'X' pattern I would expect the servo arms to be slightly aft of 90 degrees to the servo case at the neutral position.