Hangar 9 P-51 Mustang ARF Assembly Manual page 38

Section 12: Preparing the Stabilizer Assembly

Step 11
Remove the backplate from a control horn. Position the
horn 1/2" (13mm) from the inside edge of the elevator.
Align the holes with the hinge line of the stabilizer and
elevator. Mark the location for the three control horn
mounting screws using a felt-tipped pen.
Note: The elevator control horn is located
on the pilot's left side. It will be located
underneath the stabilizer/elevator when the
assembly is installed on the aircraft.

Step 12
Use a 5/64" (2mm) drill bit to drill the locations for
the screws.
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
Step 13
Use a T-pin to poke holes through the covering in the area
inside the triangle made by the three holes. Poke holes in
the covering on both sides of the rudder. Apply a small
amount of thin CA in the area made by the holes in the
following step. A few drops of thin CA into each hole is
also required. This hardens the balsa, giving the control
horn a much more solid surface to mount to. Do not use
accelerator to allow the CA to penetrate into the wood.

Step 14
Attach the control horn to the rudder using three 2mm x
12mm screws and the control horn backplate.