Hangar 9 P-51D Mustang Sport 40 ARF Assembly Manual page 33

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Step 15
The servo lead will exit the same hole in the wing root as the
aileron servo lead.
Hint: If you are installing operational flaps, leave a loop
of string around the lead so it can be differentiated from
the flap servo lead.

Step 16
Secure the servo cover to the wing using four #2 x 3/8-inch
self-tapping screws and a #1 Phillips screwdriver.

Step 17
The best way to set the flaps is to set the endpoints for the
flap travel to 0. You can then adjust the travel to achieve the
correct up and down flap settings using your radio.
Hangar 9 P-51D Mustang Sport 40 Assembly Manual

Step 18
Insert the bend in the 3-inch (76mm) aileron pushrod
through the hole in the servo horn that was enlarged back in
Step 2.

Step 19
Slide a clevis retainer on a nylon clevis.

Step 20
With the servo centered, thread the clevis on the linkage
wire. Turn the radio on and set the flap switch on the radio
to the half-flap (middle) position. Connect the clevis to the
middle hole on the flap control horn and adjust the clevis so
the control surface is set to the half-flap position of 1/2-inch
(13mm). If your radio only has two positions you can adjust
the clevis in either the up or down positions if you have set
the endpoints to 0.
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