E-flite Mini Funtana X ARF - Manual (Page 28)

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  3. Slide the remaining wing panel into position.
Secure the panels using 4-40 x 1/2" machine
screws with #4 washers (silver) using a 3/32"
hex wrench.
  4. Test fit the wing fairing (filets) into position
against the wing. You may need to loosen the
screw holding the wing in place to install the
fairing. Installing the fairing now will guarantee
that it lines up correctly with the holes in the
fuselage.