Great Planes Yak-54 3D Indoor EP ARF - GPMA1131 - Manual (Page 15)

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o 14. Locate the anti-differential arm and your aileron servo
arm. Place the anti-differential arm on the underside of the
servo arm. If you are using Futaba servo arms, the holes
in the servo arm and the holes in the anti-differential arm
will align. If you are using another brand servo arm, you will
need to use a #60 [1mm] drill bit to drill a pilot hole through
the servo arm that will align the servo arm with the anti-
differential arm.
o 15. Attach the anti-differential arm to the servo arm by
inserting the provided 3/64" [1.2mm] servo screws through
the anti-differential arm and into the servo arm.
o 16. Secure the aileron servo to the location shown using
some foam-safe CA glue.
o 17. Attach one end of each pre-assembled 2mm aileron
pushrod to either end of the anti-differential arm, and place
the servo arm onto the servo. Look closely at the picture to
determine the correct direction of the anti-differential arm.
o 18. Thread a control horn onto each end of the aileron
pushrods and glue them into the slits in the ailerons using
some CA glue.