Great Planes Piper J-3 Cub 20 Kit - GPMA0158 - Manual (Page 22)

facing upward. The notch in the upper left fuselage
doubler will have to be enlarged slightly to accept the
TTF because the fuselage doublers are identical although
right thrust must be built in.
D 10. Slide the aft fuselage top into position so the
formers key into the slots. Glue the aft fuselage top to the
formers and fuselage sides with thin CA.
D 11. Glue the cabin doubler to the aft fuselage top. The
cabin doubler may have to be slightly bent inward to
conform to the taper of the fuselage.
D 3. Trial fit the die-cut 1/8" plywood cabin brace in the
TTF and the F2A former. You may have to remove the TTF,
insert the cabin brace in the TTF, then reinstall the two
pieces simultaneously.
D 1. Do not use any glue until instructed to do so. Trial
fit the die-cut 1/8" plywood lower tank floor (LTF) between
the fuselage sides, making sure the embossed "LTF" is
facing upward - this sets the thrust angle for the firewall.
Make adjustments to the part or notches if required.
D 2. While the LTF is in position, trial fit the die-cut 1/8"
plywood top tank floor (TTF) with the embossed "TTF"
D 4. Remove all three pieces and trial fit the LTF and TTF
in the back of the firewall. It is important that the front edge
of the LTF and TTF fully contact the back of the firewall.
Make adjustments to the notches if necessary.
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