Atilla, the plane is designed to have 2 servos in the tail. If you use one servo with a pushrod, you may have to add some tail weight. To my thinking, that's just more dead weight. But it's been done both ways.

Just oen note: DO NOT use an MK bellcrank on this plane. For some reason, the failure rate is extremely high with this airplane. I know of far too many cases first hand.

Hope that helps,
-Mike