Great Planes U-Can-Do 3D EP ARF - GPMA1275 - Manual (Page 10)

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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. 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.
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14. Center all servos with your radio.
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15. Install a servo arm pointing straight up onto your
elevator servo. Slide an 80mm long, 1mm carbon rod
through the clevises on the servo and the control horn.
Adjust the linkage by sliding the rod in the clevises until you
have the elevator straight when the servo is centered. Once
you are satisfied with the linkage, secure it with a
small drop
of thin CA between the clevises and the rod. Be very careful
not to get CA in the pivoting joint between the horns and the
clevises, or on the foam parts of the model.
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16. Set up the rudder linkage using the same technique.
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17. Set up the aileron linkages using the same techniques.
In this case, both servo arms should be offset 15 degrees
forward to create a small amount of aileron differential.
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