GREAT PLANES Profile 38 Instruction Manual page 16

9. Thread a 4-40 nut onto a 4-40 x 4-1/2" [114mm]
pushrod. Make an L-bend in the non-threaded end of the
pushrod. Important: Put a drop or two of thread lock or
epoxy at the end of the threaded end of the pushrod.
Without the thread lock or epoxy the pushrod will vibrate
loose. Insert the pushrod through the slot in the sheeting
and screw the pushrod into one of the wheel collars. Make
sure the pushrod is tightened on the flat spot on the throttle
torque rod. Tighten the 4-40 nut against the wheel collar.
Make sure the pushrod and nut are tight.
10. Install the remaining two pushrods in the other two wheel
collars. The pushrods should be aligned with each other. If
the pushrods are not aligned, you may need to slightly
adjust the flat spots with a file.
11. Cut off the unthreaded portion of the pushrod. Thread
a nylon torque rod horn onto each pushrod so that the top
of the torque rod horn is flush with the end of the threads.
12. Use a bar sander to sand the top of the sub-leading
edges flush with the top of the ribs.
13. Position the wing back on its jigs. Use the two remaining
1/16" x 3" x 24" [1.6mm x 76mm x 610mm] balsa sheets to
sheet from the center of the main spar to the sub-leading
edge. Note: You may need to enlarge the slots for the
throttle torque rod horns so that they can be rotated up into
the wing to allow the wing to set on the jigs.
14. Mark the center of the landing gear torque block on
the landing gear rail. Drill a 5/32" [4mm] hole through both the
landing gear rail and torque block, perpendicular to the rail.
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