This works for control surfaces as well.

If you have altered the endpoints or exponential reset to factory settings which should be 0 for exponential and 100% for end points.

Disconnect the control rod at the servo.

Turn on transmitter then receiver and move stick to the centre position.

Adjust servo arm so it is 90 degrees to the direction of travel of the control rod. This will allow equal movement on each side of this centre position in direct relation to the stick movement.

Move the control rod to the outer most hole in the throttle arm or if its a control surface the outer most hole on the control horn.

In the case of the throttle arm move the arm back and forth to see where the centre of movement would be. Depending on the angle your control rod goes by the arm you may have to adjust it so its as close to 90 degrees in the centre position between open and closed. With a control surface just use a couple of close pins and small pieces of wood to hold the control surface in line with the fixed surface. Steering on vehicles hold the wheels straight.

Now adjust the clevis until it drops into the servo arm closest hole to the pivot point. (this is only a start)

Move the stick fully one way then the other and observe the movement. It should be equal distant each side of the 90 degree point at the throttle/control surface end. If by chance its travelling to far and you have no more holes to move the control rod in at the servo end or out and the other end you will have to reduce the end point via the transmitter. More likely there will not be enough movement.

Not moving enough move the control rod out one hole at a time on the servo arm until full travel is reached. If you reach the last hole and need even more movement then start to move the rod in at the throttle arm or control horn until the right amount of movement is attained. In some cases one might need extra long servo arms to attain the amount of movement needed.

Dennis