Hangar 9 fokker D.VII Assembly Manual page 13

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Step 8
Enlarge the hole 1/2-inch (13mm) from the center of the
servo horn using a 5/64-inch (2mm) drill bit. Use side
cutters to remove any unused arms from the horn.
o
Step 9
Secure a 6-inch (152mm) servo extension to the
aileron servo using string, unwaxed dental floss or a
commercially available connector.
o
Step 10
Tie the string located inside the wing to the aileron
servo extension.
o
Step 11
Use a hobby knife with a #11 blade to remove the
covering from the wing where the servo extension will exit.
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