Hangar 9 P-51 Mustang ARF Assembly Manual page 24

Section 7: Cowling and Fuel Tank Installation

Step 4
Tape pieces of card stock to the fuselage to indicate the
location of the firewall.

Step 5
Slide the cowling onto the fuselage. Install the propeller
drive washer and the spinner backplate. Use the nut and
washer from the engine to hold the backplate in position.
Position the cowl so there is about 1/8" (3mm) gap
between the spinner backplate and cowling. Use a felt-
tipped pen to mark the locations for the cowling screws.

Step 6
Remove the cowling and drill the locations marked in the
last step using a 1/8" (3mm) drill bit.
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
Step 7
Slide the cowling back onto the fuselage. Use tape to hold
it in position as described in Step 5. Use a 1/16" (1.5mm)
drill bit to drill into the fuselage in the locations for the
cowling screws.

Step 8
Run the 2mm x 10mm sheet metal screws into the
holes then remove them. Apply a few drops of thin CA
into the holes to harden the underlying wood. Once the
CA has fully cured, secure the screws using the four
2mm x 10mm sheet metal screws.