I have an Apple USB mouse circa 2006 (2007?) Rev. A and it appears that my scroll ball's sunken in. It doesn't look like any other Apple mouse, where the ball is somewhat flush with the surface, you can now see a gap between it and the white part. Why? I remember that I have cleaned it by rubbing it on a piece of paper after it got clogged up, and quite a bit of pressure was applied but isn't this what Apple says to do? I don't want to get a new mouse, it would be too expensive despite having discounts.