Seagull Models ZERO MS:123 Assembly Manual page 19

Wing rib.
Attach the string to the servo lead and
carefully thread it though the wing.
8) A string has been provided in the wing to
pull the aileron lead through to the wing root.
Remove the string from the wing at the servo
location and use the tape to attach it to the
servo extension lead. Pull the lead through the
wing and remove the string.
Aileron servo.
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M2x12mm.
Aileron servo.
M2x12mm.
Small weight.
String.
Flap servo.
Flap servo.
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