Hangar 9 Extra 260 Assembly Manual page 30

Section 8B – Rudder Servo Installation: DA-50
 Step 5
Screw the molded swivel link onto the 8-32 screw
until the distance from the rudder surface to the top
of the link is 11/16".
 Step 6
Remove the stock servo arms from the rudder servo
and replace it with 3D XL servo arm. 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.
30
 Step 8
Screw a 4-40 ball link 5 to 6 turns onto the 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.