Hangar 9 P-40 Warhawk Assembly Manual page 22

Section 8: Retract Linkage Installation

Step 2
Use 6-minute epoxy to glue the two retract servo tray
mounts into the wing as shown. They will rest flush with
the wing sheeting on the inside of the wing.

Step 3
Locate the retract servo tray. Use 6-minute epoxy to glue
the servo tray into position.
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
Step 4
Install a low-profile retract servo in the servo tray
using the hardware provided with the servo. Prevent
splitting the servo tray by drilling 1/16" holes for the
servo mounting screws.

Step 5
Select a servo arm from those included with your servo
that has a distance of about 1" between equally spaced
holes as shown to start with.

Step 6
Use a 5/64" drill bit to drill the appropriate holes
in the arm.