I am building a plane that has a split elevator. The two elevator halves are not connected to each other. Each has a push rod. The two push rods are connected together inside the fuse and then to a single servo. This is essentially a "Y" with the two upper sections of the "Y" going to the elevator halves (about 12 inches long) and the bottom portion (2 inches) going to a single servo.

My questions are:

1. Does the part that connects to the servo have to be in the exact center line of the plane.
2. If it is off center by about 1/2 inch, how will it effect elevator deflection (major, minor, none at all)

Thanks,