Hangar 9 J-3 Piper Cub Assembly Manual page 11

Section 3: Installing the Aileron Servos
16. Near the center section on the bottom of the wing, locate
the two servo lead openings and carefully cut away the
covering with a sharp hobby knife.
17. Carefully feed a 1/16" x 36" piece of music wire (or
equivalent wire) in through the servo lead opening inside
the wing toward the servo aileron opening. It may be
helpful to slightly bend the music wire. Using masking
tape, tape the aileron's servo connector to the end of the
music wire closest to the aileron opening. Pull the music
wire (or equivalent) and the servo connector through the
wing until it comes out the servo lead opening.
Note: With most servos, it will be necessary to use an
extension.
18. Repeat this procedure for the opposite aileron servo.
19. Plug both aileron servo connectors into a Y-harness and
feed the excess servo lead wire back into the wing.
CONTINUED
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