Great Planes Piper J-3 Cub 60 Kit - GPMA0162 - Manual (Page 28)

D 12 Cut the alignment dowel in half Trial fit the three
firewall formers together with the alignment dowels in
the holes.
D 13 Use 30-mmute epoxy to glue the doublers together
with the alignment dowels inserted Refer to the note
below Make sure all the punch marks and the embossed
numbers are facing the same direction.
NOTE: If the three firewall doublers are slightly warped, the
assembly may not flatten when clamped together To avoid
a warped firewall, clamp the three pieces to a flat table or
other rigid, flat board Before it cures, remove excess
epoxy from the notches where other parts are to fit.
D 14 If you are going to use the engine mount supplied
with the kit, drill a 15/64" hole through the firewall at each
of the four punched locations for the 8-32 blind nuts If
you are using a different engine mount, draw horizontal
and vertical centerlines through the provided punch marks,
center your mount over those lines, then mark and drill the
mounting holes for your alternate mount Notice that the
vertical "centerline" is offset to allow for the engine's
right thrust.
D 15 Lightly tap the blind nuts into the holes from the rear
of the engine mount Apply CA or 5-minute epoxy around
the flange on the blind nuts to glue them to the firewall.
D 16. Glue the die-cut 1/8" plywood formers F2A and
F2B together Line up the wing dowel holes accurately You
may use thick CA to join these two pieces From now on
the F2A/F2B assembly will be referred to as "F2" Drill a
3/16" hole at each of the three punch marks for the
pushrod tubes.
D 17 Drill 3/16" holes in the die-cut 1/8" plywood formers
F3, F4 and F5 at the punched locations.
NOTE: Die stamped numbers on all formers must face
forward.
D 1 Test fit formers F2, F3, F4 and F5 in the left fuse side.
Make adjustments if necessary Test fit the same formers in
the right fuse side.
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