Great Planes Yak-55 EP 3D ARF FlightFlex - GPMA1274 - Manual (Page 10)

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8. Press a plastic z-bend clevis into each of the four
control horns. Trim the inside of the hole in the control horn
to ease the installation of the clevis.
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9. Glue a control horn into the underside of the elevator half.
Position the control horn as far forward as possible.
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10. Secure the back side of the control horn with a control
horn retainer. Secure it with a small bead of glue.
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11. Install a control horn into the right side of the rudder
using the same procedure.
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12. Install control horns in the underside of the ailerons
using the same procedure.
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13. If necessary, remove the servo arms from all of your
servos. Find 4 long output arms with the spline size that fits
your servos. Press a plastic z-bend clevis into the outer hole
on each of these arms. Trim the hole in the arm to ease the
installation of the clevis.
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14. Install the receiver and ESC into the fuselage. Plug
the servos into the receiver and temporarily install the
battery into the fuselage. Center all servos with your radio.
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15. Attach the servo arm to the elevator servo pointing
straight up. Secure the arm with the screw included with the
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