The GSA 28 roll servo is installed into the right wing. The servo requires a universal servo mount to secure the servo to the wing spar and the aileron linkage. I followed the directions for putting the servo together. I added to 960 washers between the limits bracket and the servo so the bracket would set flush. The mount to attach the servo to the aileron would cant the limit bracket if you don't do this. I than replaced the lowest bracket of the aileron support with the servo bracket and installed the unit. I will need to run a harness from the servo toward the wing root.