I have the 66" Extra and used one #6 washer top and bottom under left side of mount to give approx 1 degree right thrust, and have setup a program mix on my radio to induce 1 degree of right rudder at idle and as throttle exceeds 50% another 1 degree of right rudder. I believe this combination produces 2 degrees right thrust up to 50% throttle and 3 degrees right above half throttle. The instructions that I received indicated that no down thrust was necessary. Hope this helps.