Great Planes Extra 300S 40 Kit - GPMA0235 - Manual (Page 18)

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3. Position the center TE's on the wing TE with the
torque rods installed, then mark the location of the notches
on the wing TE. Cut the notches in the wing TE at the
marks you made. Test fit the center TE's with the torque
rods to make sure the notches align and are large enough
to allow for proper aileron deflection.
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4. Use coarse sandpaper to scuff the nylon tube
bearings on the aileron torque rods so the glue will stick.
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5. Use 30-minute epoxy to simultaneously glue the nylon
bearing tubes in the center TE's and glue the center TE's to
the wing. Tape the TE's to the wing until the epoxy cures.
Wipe away excess epoxy before it cures and do not let
epoxy get into the nylon bearing tubes.
Hint: Before gluing, use a tooth pick to apply a dab of
petroleum jelly to the ends of the nylon tubes to keep the
epoxy out.
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6. Cut 1" from each shaped 24" aileron. Test fit the 1"
wing tip trailing edges and make sure they are aligned as
shown in the sketch. Make adjustments if necessary, then
glue the tip TE's in position with medium CA.
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7. Use a razor plane and your bar sander to shape the
LE's of the wing as shown on the plan.
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8. Use your bar sander to sand the ends of the wing flat
and even with ribs R-10.
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9. Use a ballpoint pen to trace the outline of both wing
tips onto one of the 3/16" x 1-3/4" x 10" balsa sheets.
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10. Cut the wing tips from the sheet slightly oversize,
then use medium CA to glue them to the wing. Use your
bar sander to shape the wing tips to match the contour of
the wing.
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