Hangar 9 Taylorcraft 20cc ARF Assembly Manual page 23

Step 8
Locate a 28mm aluminum standoff, 8-32 x 1 1/2-inch
socket head cap screw, #8 washer and #8 blind nut.
Place the washer and standoff on the cap screw.
Step 9
Use a 13/64-inch drill to enlarge the four engine
mounting holes in the firewall for the blind nuts.
Hangar 9 Taylorcraft 20cc Assembly Manual
Step 10
Place an 8-32 blind nut into each engine mounting
hole from the back side of the firewall. Use a 1/8-inch
hex wrench to tighten the screw against the standoff
and draw the blind nuts into the mounting holes.
Check the back of the firewall and make sure that the
blind nut flanges are fully seated against the firewall.
Step 11
Use a #1 Phillips screwdriver to loosen the screw in
the fuel tank stopper. Remove the stopper assembly
from the fuel tank. Note the orientation of the vent line
when removing the stopper assembly.
Step 12
Remove the clunk from the fuel line, and remove the
line from the back of the stopper. Replace the fuel line
with an equal length of gasoline compatible fuel
tubing. Secure the tubing to the tube in the stopper
with a small cable tie.
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