Originally Posted by greggebhardt
There is no doubt that the Bold trackball is different. I do not think returning it will help as I think that RIM has simply changed the design. Lets hope it is for the better and it is more dependable. I have not ever had a problem with my trackball in my 8820 or Curve but others have so maybe they are listening and doing something about it.
The trackball unit for the Bold is EXACTLY THE SAME
as the 81xx/88xx/83xx. The only difference is the chromed trim ring and how you access the ball to swap it out. The 81xx, 83xx, 88xx is so easy to access, you can swap it out with your fingernail. The Bold requires a complete disassembly.
Regarding the rough versus smooth rolling action. There are two generations of the trackball; the first with a smooth rolling action, the second with "teeth/gears" on the white plastic rollers that touch the ball and provides a more tactile feel and helps to prevent ball slippage.
What's funny is that this design is similar the old "ball" mouse design that has long been replaced by the more reliable LED/optical mouse. Imagine turning one of these old ball mice upside down, shrinking it then rolling the ball with your finger. The difference now is that instead of optically sensing slits on discs, it reads the polarity change of magnetic drums mounted on those plastic white rollers.