Just to clarify for you, putting the slider under the throttle stick in the middle is necessary. It has nothing to do with the servos; it's a means of balancing the two motors so the heli does not want to spin in flight. Try putting the slider in the center before touching any pot. We also should have told you that the holes in the servo arms are usually on the tight side and might need to be opened up a touch so the rod doesn't bind in the hole. Be advised that nothing
on this heli can stand any binding, especially the flybar.