Hangar 9 Piper J-3 Cub 40 ARF - Manual (Page 30)

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  Step 8
Support the fuselage so the wing is not resting on the
work surface. Adjust the strut end so it aligns with the
wing strut mount. Attach the wing struts using two
4-40 x 1/2" socket head bolts and two 4-40 locking
nuts. Once attached, tighten the 4-40 nuts on the strut to
prevent the end from rotating when the wing is removed
for storage.
 Step 9
Repeat Steps 1 through 8 to install the remaining wing
panel and strut.
 Step 10
Install the fuselage hatch using four #2 x 3/8" screws.
Note: When removing the wing, simply
disconnect the bolts holding the strut to the
fuselage. This will make things much easier
when installing the wing at the field.
Note: The struts on the J-3 Cub are
functional, so be sure all bolts and nuts
are tight before flying. Failure to do so
could result in wing failure.
Section 9: Wing Installation