Great Planes Piper J-3 Cub 40 Kit - GPMA0160 - Manual (Page 17)

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10. Glue the die-cut 1/16" ply TE Joiner (CUB4W05) in
place between the #1B ribs as shown in the photo.
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11. Glue the 5/16" x 3/8" x 1" basswood Aileron Servo
Rails (CUB4W22) to the inboard sides of both #1B ribs as
shown on the plans. Line up the front edge of each servo rail
with the embossed angled line near the back of the pushrod
hole in the ribs. The embossed line will be on the wrong side
of one rib, but you can still eye it while positioning the servo
rail. NOTE: If you are using a servo smaller than a Futaba
S148, you may need to glue a spacer between the servo
rails and the ribs to correctly space the rails to fit your servo.
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12. Cut all the arms except one off of a large servo horn
and mount the Threaded Ball (SCRW058) in the outer hole
of the arm as shown in the photo. Install the arm on the
servo so it is perpendicular to the servo (neutral position).
(Wing is upside down in photo.)
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13. Hold your aileron servo in position against the servo
rails and mark where to drill the mounting holes. Drill 1/16"
holes at each mark and mount your servo using the screws
provided with the servo. NOTE: The screws are installed
from the bottom side of the servo lugs.
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14. Drill a 1/8" hole at the punch mark on each die-cut 1/8"
plywood Bellcrank Mounting Plate (CUB4W09). Assemble
the 90 degree nylon bellcranks on each plate as shown in the
sketch above. NOTE: The outer holes in each bellcrank must
be drilled with a #49 (5/64") drill to ensure a good slop-free
fit to the .074" diameter pushrod wires. Apply epoxy to the
bellcrank nut and bolt to prevent them from loosening
but do not get epoxy on the bellcrank.
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15. Position the bellcrank mounting plates in the notches
provided in the #6 ribs with the bellcranks on the bottom
side of the wing and securely glue them in place.
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16. Cut two 24" long pieces of Threaded Pushrod Wire
from the two .074" x 35" pushrod wires that are threaded on
both ends (WIRES10). NOTE: Save the remaining pieces
of pushrod wire for another step.
Install Aileron Linkage
17