Great Planes Proud Bird ARF - GPMA1260 - Manual (Page 14)

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15. Drill 5/64" [2mm] holes at the marks you made. Install
the control horn using two 2x12mm machine screws and a
control horn backplate.
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16. Use a small spring clamp or tape to hold the elevators
in the neutral position.
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17. Mark the pushrod where it crosses the innermost hole
in the elevator servo arm.
Pushrod Wire
Servo Arm
1/4" [6.4 mm]
FasLink
Remove the pushrod from the plane. Bend the pushrod 90
degrees at your mark and cut off the excess pushrod 1/4"
[6.4mm] beyond the bend. Enlarge the inner hole of the pushrod
to 5/64" [2mm]. Remove the clevis from the pushrod and insert
the pushrod back into the pushrod tube. Reinstall the clevis
onto the pushrod. Connect the bend in the pushrod into the
inner hole of the servo arm and secure it using a FasLink.
Connect the clevis to the outer hole of the elevator control
horn. Remove the spring clamp and check the elevator servo
one more time with your radio system. Make any adjustments
to the clevis position on the pushrod to ensure the elevators
are centered with the servo centered. When satisfi ed, slide
the clevis retainer toward the aft end of the clevis.
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18. The rudder pushrod is installed in the same way as
the elevator pushrod.