Hey guys,
The question and answer idea is a good one. But for now we had better get this straight. What you are talking about is dissymetry of lift. In the teetering heads that we are talking about the blades 'Flap to equality'(the tail rotor does the exact same thing). Flapping to equality occurs when an advancing blade experiences increasing lift due to increased relative airflow. This causes the blade to rise (flap up). As it flaps up it experiences increased induced flow, which effectively reduces the angle of attack of the blade and limits the upward motion. On the retrating blade less lift is produced due to reduced relative airflow. This causes ther blade to descend (flap down), resulting in less induced airflow and a larger angle of attack. The larger angle of attack restores lift and limits the blades downward motion. Not, I'm afraid, because of a change of pitch produced by the pitch links. In fact it is all an aerodynamic reaction not a physical change in the blades pitch.
Cheers.