Great Planes Extra 300S 40 Kit - GPMA0235 - Manual (Page 33)

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9. Position the control horns on the elevator and rudder
as shown in the sketch and on the plan. Use a ballpoint pen
to mark the location of the control horn mounting holes and
drill 3/32" holes at the marks. Temporarily mount the control
horns to the rudder and elevator with the backing plates
and 2-56 x 5/8" screws.
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10. With the servos centered and the control surfaces in
neutral position, use a felt-tip pen to mark where the
pushrods cross the mounting holes in the servo arms.
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11. Disconnect the clevises from the control horns, then
make a 90 degree bend at the marks you made. Temporarily
install a nylon Faslink on each pushrod, then cut the wire so
it slightly protrudes out of the Faslink.
Hint: If you prefer to bend and cut the pushrods out of the
fuselage remove the pushrods, then make the 90 degree
bends and cut the wire. Unscrew the clevises and reinstall
the pushrods in the guide tubes from the front, then screw
the clevises back on.
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12. Connect the pushrods to the servos with the Faslinks.
Note: If necessary, enlarge the holes in the servo arms
with a 5/64" drill bit (or a #48 drill for precision).
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13. Mount the aileron servo in the wing, then thread the
nylon 6-32 torque rod connectors on the torque rods until
they are 3/4" from the wing sheeting.
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14. Use the 7" long wire rods cut from the 36" pushrods
to make the aileron pushrods. Connect the pushrods the
same way you did for the elevator and rudder with the nylon
clevises and faslinks.
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15. If you haven't already done so, sand the bottom of
the rudder so it is even with the bottom of the fuselage,
then round the bottom of the rudder to match the trailing
edge. Mark the location of the tail gear wire on the rudder
and the nylon tail gear bearing on the fuselage.
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16. Remove the rudder and drill a 3/32" hole in the
leading edge at the mark you made for the tail gear wire,
then cut a groove for the nylon tail gear bearing (use a
5/32" brass tube sharpened at one end to cut the groove
the same way we showed you for the elevators.) Test fit the
tail gear wire in the rudder.
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