I posted earlier about how my collective seemed to change suddenly when hovering, rotor speed would suddenly drop but not much change in altitude, I finally noticed that my blade tracking would suddenly go out of whack which apparently caused the rotor speed to change. Someone suggested that my ball links may be binding. I upgraded to alum swash and bell/hiller and the problem is gone, very solid feel.

Do ball links have tendency to cause binding as a result of wear? If so, would applying graphite powder to them help?