E-flite J-3 Cub 25 ARF - Manual (Page 46)

 5. After sanding the edges of the windows, use
canopy glue to secure them to the inside of the
fuselage. Use tape to hold them in position until
the glue fully cures.
  6. Attach the wing to the fuselage. Place the
struts so the arrow on the strut is facing up and
is pointing towards the front of the plane.
Secure the strut using three 2mm x 10mm sheet
metal screws.
 7. Repeat Step 6 for the remaining wing strut.
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