Great Planes Piper J-3 Cub 20 Kit - GPMA0158 - Manual (Page 31)

D 4. If you prefer to shorten the screws for better
appearance, use a Dremel Moto Tool and a cut-off wheel to
cut the screws. Remove the screws from the airplane
before cutting. After cutting, use a file to slightly chamfer
the end of the threads, similar to the original screw.
D 1. Install the tail gear "arm" into the hole you made in the
rudder. Hold the rudder up to the tin.
D 2. Mark the location of the tail gear bearing on the aft
edge of the fuselage. Cut a slot in the center of the tail post
to accept the tail gear bearing. Hint: Use a 1/16" bit to drill
several closely spaced holes, then connect the holes using
a hobby knife.
D 3. Temporarily install the bearing and rudder. The rudder
should fit flush with the fin and aft edge of the fuse. If not,
check if the bearing is fully seated or that the groove in the
rudder is deep enough. Note: Do not glue the bearing in
place until after the model is covered.
D 1. Use a flat file to chamfer both ends of each main
landing gear wire, removing any sharp edges.
D 2. Refer to the plan and the photo above to determine
the locations to drill the landing gear holes. One hole
should touch the aft edge of the groove and the other hole,
the forward edge. Both holes are approximately 1/2"
inboard from the f u s e l a g e sides. Drill 5/32" holes
perpendicular to the main landing gear rail. The holes go
through the main landing gear rail and the main landing
gear block.
D 3. Install the landing gear wires in the main landing
gear rail. The wires lay side-by-side and flush with the top
of the main landing gear rail. You will have to carve the
inner corners of the holes slightly to allow for the bend in
the landing gear wires.
D 4. Position the nylon landing gear straps over the
landing gear wires, approximately 1" from the fuse sides.
Mark the locations for the mounting screws. Drill a 1/16"
hole at each of these marks.
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