The Tour trackball not scrolling side ways is a mechanical defect, and a very common one. I have successfully swaped out a Sprint Tour trackball with Sprint Pearl trackball. Actually, the Sprint 8830, Pearl & Curve all use the same trackball.
Its no where nearly as easy to remove the Tour trackball as previous blackberries. You have to be particularly careful when removing the plastic cover over the earpeice to not break the two plastic clips to expose screws below it.
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