Great Planes Extra 300S 1.20 ARF Patty Wagstaff - GPMA1305 - Manual (Page 22)

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12. Cut up two large servo arms as shown. Find two
large control horns and eight #4 x 5/8" [16mm] screws.
Connect the unthreaded clevis to the servo arm and the
threaded clevis to the control horn. Install the servo arm on
the servo and position the control horn on the elevator’s
control horn mounting block, so that the pushrod is 90 degrees
to the hinge line and the control horn is right at the edge of
the elevator bevel. Mark the holes for the base of the control
horns with a Top Flite Panel Line Pen. Please note the
orientation of the servo arms and pushrods in the above image.
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13. Remove the control horn and drill a 1/16" [1.6mm]
pilot hole 1/2" [13mm] deep at the marks. Make sure you do
not drill through the other side of the elevator. Wick some
thin CA into the holes and re-install the control horn using
four #4 x 5/8" [16mm] screws. Tighten the hex nut against
the threaded clevis. Repeat this procedure for the other elevator.
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14. Feel through the MonoKote for the rudder servo cut
outs in the aft fuselage. There should be one on each side
of the aft fuselage. 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 openings.
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15. Connect the servo extensions and/or “Y” harnesses
you need for your radio setup through the fuselage and into
the rudder servo openings and through the stab center hole.
Remember: If you are using a computer radio, you will only
use 24" [610mm] extensions in this step. If you are using a
non-computer radio, you will need two 12" [305mm]
extensions, a “Y” harness for the rudder and a reversing “Y”
harness for the elevator.
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16. Connect the rudder servo leads to the rudder extensions
and use either tape or heat shrink tubing to secure them.
Install the rudder servos on the fuselage using the hardware
supplied by the manufacturer. Remember, there is a servo
on each side of the fuse.
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