A small space where the axle is visible

I don’t know about that, I think the system is designed to allow the user to replace bearings when they’re worn. I do find that the bearings are impossible to get off the hub with a puller, and I was initially suprised when my bearing shifted, but since using the correct spacers I have had zero problems.

Maybe Kris could address the issue better?

If you’re going to do trials, forget about that. Treat your unicycle with no care. It’s alot better that way.