Great Planes Proud Bird ARF - GPMA1260 - Manual (Page 8)

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8. Align the holes in the wing bolt plate with the wing bolt
holes in the wing and use a felt-tip pen to trace around the
plate onto the wing.
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9. Use a sharp hobby knife or follow the expert tip below, to
remove the covering 1/16" [1.6mm] inside the lines you drew.
Use denatured alcohol to wipe away the lines. Avoid getting
any glue into the exposed holes beneath the covering.
HOW TO CUT COVERING FROM BALSA
Use a soldering iron to cut the covering from the area
beneath the wing bolt plate. The tip of the soldering iron
doesn’t have to be sharp, but a fi ne tip does work best.
Allow the iron to heat fully.
Use a straightedge to guide the soldering iron at a rate that
will just melt the covering and not burn into the wood. The
hotter the soldering iron, the faster it must travel to melt a
fi ne cut. Peel off the covering.
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10. Glue the wing bolt plate to the wing being sure that
the holes in the plate are aligned with the holes in the wing.