Hi!
You just alter the position where linkage fits the servo arm (or controll arm on the elevator or siderudder).... moving the linkage in on the servo arm....you get less throw....move it out...and you get more throw ( and gearbox play...so be careful what you do).

The general rule in installation of servos in ANY vehicle is to have as short servo arm as possible (to avoid gearbox play)...and to have as long control arm as possible.
See pictures of my Q-500 pylonracer.
Regards!
Jan K
Sweden