Great Planes Cherokee GP/EP ARF - GPMA1033 - Manual (Page 12)

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3. Drill 3/32" [2.4mm] holes at your marks completely
through the elevator. Apply a couple drops of thin CA to each
hole to harden the surrounding wood. Install a control horn
and backplate onto the underside of the elevator using two
2-56 x 1/2" [13mm] machine screws.
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4. Install a control horn onto the left side of the rudder in
the same manner.
Install the Tail Servos & Pushrods
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1. Cut two arms from a four-armed servo arm and enlarge
the outer hole of one remaining arm with a 5/64" [2mm] drill
bit and the second inner hole of the other remaining arm
with the same bit. Center the rudder servo with your radio
system and install the servo arm perpendicular to the servo
case as shown, with the outer drilled hole toward the center
of the fuselage.
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2. Temporarily insert a 36" [914mm] pushrod into the
rudder outer pushrod tube. Use the pushrod to position the
rudder servo onto the servo tray in the fuselage as shown.
Align the outer hole of the inside servo arm with the pushrod.
Thread a servo mounting screw (included with the servo)
into each mounting hole in the servo and back it out. Apply
a couple drops of thin CA to each hole in the servo tray to
harden the surrounding wood. Mount the servo using the
hardware included with the servo.
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3. Cut three arms from a four-armed servo arm and
enlarge the outer hole of the remaining arm with a 5/64"