Great Planes Yak-54 3D Indoor EP ARF - GPMA1131 - Manual (Page 13)

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o 5. Install the elevator control horn by first threading it onto
the z-bend at the end of the elevator pushrod. Then place
some foam safe CA glue onto the base of the control horn.
Insert the pushrod into the slit in the elevator. The slit in the
control horn should fit over the carbon elevator joiner. If the
control horn will not fit over the carbon joiner, simply remove
the excess glue from the slit to achieve a snug fit.
o 6. Attach one of the included z-bends to the 21-11/16" x
3/64" [550 x 1mm] carbon rudder pushrod, using one of the
provided 1" [25.4mm] lengths of heat shrink. Use a soldering
iron or heat gun to shrink the pushrod to the z-bend.
o 7. Use some foam safe CA to glue the foam servo doubler
around the rudder servo slot. NOTE: The rudder servo
doubler should be glued on the opposite side of the fuselage
from the elevator servo.
o 8. Starting from the nose of the airframe, thread the
rudder pushrod you have partially assembled through the 5
pushrod supports. The z-bend you have applied should end
up at the servo mount.