Great Planes PT-40 MkII Kit - GPMA0118 - Manual (Page 19)

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14. Hold the die-cut 3/32" balsa fuse top at the edge of
your work table, then gently “crack” the wood along the die-
cut score line. Do not break the part in two. Hint: Bend
the fuse top away from the side that has the score
on it.
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15. Use a straightedge and a ballpoint pen to draw a line
across the notches on the fuse top at the score line. Cut
two 1/4" wide strips from 3/32" scrap balsa and glue them
to the inside of the fuse top on either side of the score line
between the lines you marked. Note: If building the PT-20,
the 3/32" balsa strips must be shorter than the ones shown
in the photo to fit between the fuselage doublers.
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16. Test fit the fuse top to the fuselage. Glue it in position
by wicking thin CA into the joint between the top, former tabs,
and the sides. Follow with medium CA to fill in any gaps.
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17. Use epoxy to glue the wing bolt plate assembly into
the notches of the plywood doublers and F-3. We
recommend that you perform this step even if you are not
going to use the bolt-on wing option.
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19. Carefully sand or cut a bevel along the bottom of the
notch in the windshield. This bevel will allow the windshield
to fit flush against F-2.
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20. When the windshield fits properly, glue it in position
with medium CA. Sand the top of former F-2 (A) flush with
the front surface of the windshield. Sand the rear of the
windshield overhang flush with the back of F-2.
Skip step #21 if you are building the PT-20.
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21. Test fit the die-cut 1/8" balsa nose blocks in the
engine compartment, then glue them in position with epoxy.
After the epoxy has cured, sand the outside edges flush
with the fuse.
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18. Increase the depth of the notch in the die-cut 1/8"
windshield by 1/8" to allow for F-2A (the windshield for
the PT-20 is balsa). See the following photo.