Great Planes Piper J-3 Cub 60 Kit - GPMA0162 - Manual (Page 35)

D 2. Lightly sand the wing saddle area of the fuselage to
remove any glue bumps or slivers of wood. If you elect to
use wing seating foam tape (this is an option, our Cub 60
uses none) take this into account while mounting your wing
to the fuselage. Place the wing in the saddle and carefully
align it by measuring from the corners of the aileron bays
to the aft edge of the fuselage. Adjust the wing until both
measurements are equal. When the wing is perfectly
aligned, make reference marks on the wing trailing edge
and former F3 to help keep the parts aligned during the
next step.
D 1. Slide the fin post through the slot in the stabilizer and
make sure that the fin base will meet the stab. You may cut
a notch in the back edge of the fin leading edge to get it to
fit - do not cut a notch in the stabilizer leading edge. Use
a 90-degree triangle to keep the fin perpendicular to the
stabilizer and stabilizer trailing edge. Securely glue the fin
to the stabilizer with 30-minute epoxy.
D 3. While holding the wing securely in position (you
should use tape,) use a #10 (or 13/64") drill bit to drill
through the wing bolt plate, the wing, and the wing bolt
blocks in the fuselage. Two small 90-degree triangles help
you to align the drill perpendicular to the top surface of the
wing. IMPORTANT: Do not allow the wing to shift
during this procedure.
D 4. Remove the wing and use a 1/4-20 tap to cut threads
into the wing bolt blocks.
D 5. Enlarge the holes in only the wing with a 17/64" drill bit.
D 2. Test fit the fin/stab into the fuselage. Lengthen the
slots in the fuselage if needed to get the stab to fit down
onto the stabilizer base.
D 3. Mount the wing to the fuselage. Verify that the stab is
aligned with the wing and the fin is aligned with the
centerline of the fuselage. When this is achieved, securely
glue the stab and fin to the fuselage with 30-minute epoxy.
Double-check this alignment while the epoxy is curing.
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