Just as an aside, I had the equivalent bearings/races get all shot in the propeller of my airplane about 5 years ago. This is what's known as a constant-speed prop, where there is a governor to keep the speed constant as you increase/increase throttle. Well, the blades would pop between detents and overspeed or react to every throttle movement with a change in power, like a fixed-pitch prop. Cost me $6 K to get repaired.
And I've driven a bike with this malady. I don't see how anyone rides a bike like this, with those built-in click-stops. What a hassle.