[sander]

We've started buying the replacements trackballs from various vendors for our 8330's but they don't seem to last very long. The rollers seem to break easily and the balls don't roll as smoothly. Is anyone else noticing this on the replacement trackballs? I wonder if these parts are oem or aftermarket.

[rick chi-town]

I have certainly noticed a lesser quality ball as well. I have replaced many and all seem to have that "herky-jerky" feel to them, not nearly as smooth as stock. I would most likely say aftermarket parts. The worst I havenoticed are the all black ones...