Hangar 9 Piper J-3 Cub 40 ARF - Manual (Page 16)

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 Step 2
Slide the wing strut mount into the opening. Secure the
mount using two #4 x 3/8" screws.
 Step 3
Install the recommended servo hardware (grommets and
eyelets) supplied with the servos into the throttle, rudder,
and elevator servos.
 Step 4
Use the hardware provided with the servos to mount them
in the fuselage.
 Step 5
Place a clevis retainer onto a clevis. Thread the clevis
onto a 32" pushrod wire. Remove the backplate from a
control horn, and then attach the clevis to the control
horn. Slide the pushrod into the rudder pushrod tube in
the fuselage. Position the horn so the holes align with the
hinge line. Use a felt-tipped pen to mark the positions for
the three mounting bolts.
 Step 6
Drill the locations marked in the previous step using
a 3/32" drill bit. Place a few drops of thin CA into
each of the holes to harden the balsa. Attach the control
horn using three 2mm x 12mm screws and the control
horn backplate.
Section 4: Servo Installation (Fuselage)