Hangar 9 P-40 Warhawk Assembly Manual page 26

Section 9: Four-Stroke Engine Installation

Step 6
Determine the proper location for the throttle pushrod.
Mark the location with a felt-tipped pen. Remove the
engine and drill the firewall for the pushrod tube using a
drill and 5/32" drill bit.

Step 7
Drill a 5/32" hole in the former with the wing dowel holes
that corresponds to the side of the hole drilled in the
firewall. Make sure to drill so the pushrod won't interfere
with the wing.
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
Step 8
Test fit the throttle pushrod tube through the firewall,
through former 2, and into the fuselage. Once satisfied
with the fit, roughen the tube using medium sandpaper.
Slide the tube back into position and use medium CA to
glue it to the firewall.