Hangar 9 P-51 Mustang ARF Assembly Manual page 31

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Step 12
Remove the servo horn from the throttle servo. Drill the
outer hole on one of the longer arms using a 5/64" (2mm)
drill bit. Slide the brass connector into the hole from the
top of the servo horn. Secure the brass connector by
sliding the connector backplate onto the connector from
the bottom of the servo horn.

Step 13
With the radio system on, center the throttle stick and
throttle trim. Slide the throttle pushrod wire through the
connector then install the servo horn as shown. This will
provide equal travel for both high and low throttle, making
setting up the linkage much easier. Temporarily install the
setscrew into the brass connector.
Section 10: Radio and Linkage Installation

Step 14
Place a clevis retainer onto a clevis. Thread the clevis onto
the elevator pushrod wire a few turns so it won't fall off.
Repeat this for the rudder pushrod as well.
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