Great Planes Extra 300S 1.20 ARF Patty Wagstaff - GPMA1305 - Manual (Page 9)

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8. Feel through the MonoKote covering on the bottom
surface of the wing and find the opening for the aileron
servo. Cut the covering 1/8" [3.2mm] inside the opening.
Use a sealing iron or trim seal tool to seal the covering to
the edges of the opening.
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9. Connect one 12" [305mm] servo lead extension to
the aileron servo. Use heat shrink tubing or tape to secure
the connection. Tie the string inside the aileron servo
opening to the aileron servo lead. Pull the servo lead out of
the end of the wing with the string.
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10. Test fit the servo in the opening and trim the opening
if necessary. Mark the location of the servo mounting screws
and drill 1/16" [1.6mm] holes at the marks. Wick some thin
CA in the holes you just made and install the aileron servo
with the hardware that was supplied with it.
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11. Install a threaded metal clevis approximately 18
full turns onto one of the 12" [305mm] threaded one end
pushrods. Connect the clevis to a large nylon control horn
and slip a silicone retainer onto it. Align the pushrod 90
degrees to the aileron’s edge as shown above and mark the
control horn’s holes on the aileron. Make sure that the control
horn is positioned on the aileron’s plywood mounting plate.
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12. Use a 1/16" [1.6mm] drill bit to drill the control horn’s
screw holes. Wrap masking tape 1/4" [6.4mm] from the end
of the bit as a guide to keep from drilling the holes too deep.
Do not drill through. Wick some thin CA into the holes and
mount the control horn using four #4 x 5/8" [16mm] screws. It is
important that you use thin CA to strengthen the holes.
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