Great Planes PT-19 EP ARF - GPMA1149 - Manual (Page 13)

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3. Epoxy the servo mounting plate to the servo tray. Screw
the elevator servo in position so that the output shaft of the
servo is oriented forward.
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4. Locate a nylon control horn. Clip the backplate from the
horn and trim off the sprue.
Center the
control arm
pushrod holes
over the hinge line.
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5. Fit the Z-bend side of the elevator pushrod into the
outer pushrod hole of the control horn. Position the horn over
the elevator as shown so that the pushrod holes are aligned
directly over the hinge line and the pushrod is relaxed side-
to-side. Mark the position of the screw holes and drill the
elevator using a 5/64" [2mm] drill. Note: Be careful when
you position the horn! Align it side-to-side so that you won’t
interfere with the elevator joiner wire when you drill through
the elevator.
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6. Install the elevator horn onto the elevator using
two 2mm x 10mm machine screws and the nylon control
horn backplate.