Hello!
It is really very simple.....There are Two things to remember!
Aways strive for as short servo arm as possible on the servos(to reduce play in the gearbox)and to use as much area on the potentiometer.The servo is also stronger as closer you get to the center

AND always strive for as long arm on the rudder/Aileron /elevator horn as possible to minimize play.
THIS IS THE RULE!

Never minimize the throw on any servo if it is possible as this gives you the whole gearbox-play and a shorter traveling distans for the servo arm (that induces play).


Regards!
Jan K
Sweden
Pylonflyer!