Hangar 9 Piper J-3 Cub 40 ARF - Manual (Page 29)

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  Step 4
Thread a 4-40 nut onto the threaded end of the strut.
Thread a strut end onto the strut. The nut will be used
once the strut has been adjusted.
  Step 5
Install the short strut brace to the rear strut support
anchor and the long strut brace to the front strut support
anchor using 4-40 x 1/2" socket head screws and
4-40 nuts. Attach the strut supports and the strut cross
brace using two 4-40 x 1/2" socket head screws and
two 4-40 lock nuts.
  Step 6
Slide the wing tube into the wing panel. Slide the tube and
panel into position on the fuselage.
  Step 7
Secure the wing panel using a 1/4-20 x 2" nylon bolt.
Step 5 Photo
Section 9: Wing Installation