I have a Logitech Trackman Marble Wheel(thumb optical trackball) that's getting jerky and queaky. I tried cleaning the 3 contact points for the ball with alcohol, but that made too much friction between the contact points and the ball, resulting in a difficult to move ball. After a few days of use, the ball started moving smooth again, but now it's back to being jerky. Anything I can do to make it stay turning smooth?