Using a felt pen, outline the desired length to make grinding easier. Then remove the
wings and use a sanding block to grind down the wing root's edge.
Continue grinding and remounting the wings until a gap of 2 to 3 mm exists between
each wing and the fuselage.
Then take a feeler gauge and measure the gap that exists beetween the roof's frame and
each wing spar. Write these two measurements down on paper.
Take the two inserts, which are used to fix the roof's frame to the wing spars, and
shorten their heads slightly on the lathe to match the measurements you wrote down
before. Then mount them into the roof's frame. Once mounted, the inserts should rest
nicely against the surface of the wing spars.
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