Hangar 9 Alpha 40 ARF Assembly Manual page 34

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Step 4
Use a pin vise and 5/64-inch (2mm) drill bit to enlarge a hole
on the servo horn that is 1/2-inch (12mm) from the center of
the servo horn on the side closest to the rudder pushrod tube.

Step 5
Remove the horn from the servo. Insert the pushrod
connector in the outer hole of the servo horn.
34

Step 6
Place the small washer on the opposite side of the horn. The
connector is then secured using a small E-clip. Use pliers to
snap the E-clip in position.

Step 7
Slide the 2-56 x 28-inch pushrod wire into the tube in the
fuselage for the rudder. Make sure the threaded end goes
into the tube first. Use a hobby knife and #11 blade to trim
the covering on the fuselage where the pushrod exits.
Hangar 9 Alpha 40 ARF Assembly Manual