I was talking to Bill Smith, Mr 3 cushion here and he mentioned that the measles billiard balls in the local pool room all had flat spots. I was there today and indeed, every spot on the white and yellow ball was either flat or had shrunk more than the rest of the ball. With the spot at the bottom of the ball, a gentle touch would make the ball move but it would rock back and leave the balls frozen. I couldn't feel it or see it on the ball but the behavior of both balls was the same. Does this happen to cue balls as well?