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@groxx @molly0xfff It's a cylinder within the casing, so the rotation of the cylinder gives you the up/down movement. Left/right is done by the equivalent movement of the cylinder within. It doesn't spring back, but there is a button at end within the housing which sends the pointer out to the extreme in if you run out of movement. (I think! It's been ages since it became intuitive, and I don't have it in front of me right now). I've got a fast cursor, so don't usually hit the ends.

@molly0xfff Would love to try something like that, although I'm a fraudulent touch-typer, so it might be a painful transition. Also, I use a RollerMouse, and that's unlikely to play nicely with this sort of thing.