If you look at
this impressive picture, you can notice that the deflections of the left and right elevator is different.
Is there no mechanical link between the elevators?
How are the right/left tabs connected?
If Airflow is non symmetric (yaw angle, rudder deflection), does this result in an asymetric elevator deflection? Is this intentionally and some sort of automatic load allevation, or is this just the price you pay for a simple design?