Great Planes Piper J-3 Cub 60 Kit - GPMA0162 - Manual (Page 34)

D 6. Install eight 6-32 blind nuts on the inside of the
landing gear block. Use 6-minute epoxy to hold the blind
nuts permanently. Hint: Pull the blind nuts into the LG
block by tightening them with a screw and washer inserted
from the outside of the LG block. Do not over-tighten.
D 7. Test fit the landing gear with eight 6-32 x 1/2"
Phillips head machine screws. Remove the landing gear
and continue construction.
D 2. Use a sanding block to sand the bottom of the
fuselage flat to make it ready to accept the bottom sheeting.
D 3. Sheet the bottom of the fuselage with the 1/8" x 3" x
36" balsa sheet. The sheeting is applied cross-grain and
does not cover the landing gear block, but overlaps it 1/8"
at both ends. After the sheet has been applied, trim and
sand the edges per the cross-section, slightly rounding the
corners. Add 1/8" x 1/8" pieces of balsa at the front and
sides of the strut blocks.
D 4. If you have installed an internal antenna tube, apply
balsa filler where the antenna tube exits the sheeting at the
rear and sand the tube flush with the fuselage bottom.
Our prototype Cub 60 uses scale landing gear shock struts
constructed from brass tubing and brass shim stock. See
the "Scale Details" section for more information.
D 1. Using medium CA, glue the tapered balsa tail wedge
in position where the rear fuselage sides meet.
D 1. Test fit and glue the 1/2" x 1" x 2-1/4" maple wing
bolt blocks in the fuselage with 30-minute epoxy. Use
plenty of epoxy for a very secure installation.
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