Great Planes P-51 Mustang GP/EP ARF - GPMA1205 - Manual (Page 7)

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2. Attach a 6" [152mm] servo extension to each aileron servo
and secure the connector using tape or heat shrink tubing
(not included). Center the servos with your radio system and
install the servo arms to the servos perpendicular to the servo
cases as shown. Be sure to reinstall the servo arm screws
into the servos. Install the rubber grommets and eyelets onto
the servo mounting tabs.
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3. Use the strings taped inside the aileron servo openings
to pull the servo leads through the wing.
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4. Fit the servos into the servo openings and drill 1/16"
[1.6mm] holes through the mounting tabs on the servo cases
into the rails. Thread a servo mounting screw (included with
the servo) into each hole and back it out. Apply a drop of thin
CA to each hole to harden the surrounding wood. When the
CA has dried, install the servos into the openings using the
screws supplied with the servos.
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5. Locate the two 4" [102mm] pushrods that have clevises
already threaded onto the ends of the wires. Slide a silicone
clevis retainer onto the base of each clevis. Attach the clevises
to the outer holes of the aileron control horns. With the ailerons
in the neutral positions (use tape or a small clamp to hold
them in place), mark the pushrod wires where they cross the
second inner holes in the servo arms.