For any genaric trainer computer radio or not. Always start out with the pushrods for the elevator and ailerons two servos or one on the inside holes at the servos and furthest hole out on the controls surfaces. If you have a computer radio you can fine tune from here.

On the rudder use the middle hole at the servo and the furthest out at the rudder. However for the nosewheel you want the nosewheel pushrod on the inside hold at the servo and furthest out at the nosewheel. This will give you less nosewheel travel than the rudder and definately what you want.

Excessive throws is at the top of the list of the new airplanes I check. Number two is CG to far aft for any number of reasons and excusses.

Indeed RCKens picture is the way to mechanically apply aileron differential. You can also do this with a two aileron servo set up. Another way is electronically depending on the radio you may or may not have.

What differental is, allows the upward moving aileron to move further than the downward moving aileron. This in turn minimises the higher drag (adverse yaw) of the downward moving one and the airplane will track nice around a turn instead of wallowing around with the nose wanting to point away from the turn.

John