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Step 6
Remove the stock servo arms from the rudder servo
and replace it with a Hangar 9 3D XL 1/2 Servo Arm
4-40: JR. The arm faces down as shown. Be sure to use a
drop of threadlock on the servo arm screw if using
metal-geared servos.
Step 7
Use the included 4-40 screws and nuts to attach the ball
link to the outer hole in the arm. The correct sequence
is 4-40 screw, ball link, servo arm, and 4-40 locknut. Be
sure to use threadlock.
Step 8
Screw a 4-40 ball link 5 to 6 turns onto a 5" rudder
linkage. Screw the opposite end of the linkage into the
swivel control horn on the rudder. Adjust the linkage
length until the hole in the ball link lines up with the outer
hole in the servo arm when the rudder is neutral and the
servo arm is centered.
Section 7B – Rudder Servo Installation: Tail Mounted