I'm having a problem with my Happ trackball. Whenever I roll it to the right, it feels pretty smooth. But when I roll it to the left, it feels "jerky" like it's skipping or something, and it won't roll freely. I understand they need to be lubed once in awhile, but it seems like it wouldn't roll in either direction if this was my problem. But I don't know much about how these things work so I could be dead wrong.
Any ideas?