Hangar 9 35% Extra 300 ARF (3 Boxes) - Manual (Page 16)

16 35% Extra 300 ARF Assembly Manual
apply some CA to harden the wall. Once CA is dry, mount the
servo.
 6. Prepare the servo linkage.
 7. Mount the control horn. Adjust the height to 1 7/8 inch
from the rudder hinge line to the center of the pivot point on
the horn.
 8. Attach the ball link to 1 1/2-inch servo arm.
 9. Power up the servo by connecting to the receiver and
with radio sub-trim at 0, mount the arm towards the bottom
of the aircraft and parallel to the hinge line.
 10. Apply threadlock to the servo center screw and
mount the servo arm.
 11. Mount the servo arm setscrews.
 12. Using a Hangar 9 Pro-Link Wrench, adjust the length
of the linkage so when the servo arm is parallel to the rudder
hinge line, rudder is at center.