Who says they need rebuilding? They're quality. I'm reusing a knackered one after my other hub snapped, and last night, I heard the funkiest noises evar. High pitched squealing noises coming from the hub and it slowly got tighter and tighter until it fully jammed and didn't move - until I forced to turn again by pushing down on the pedals a fair amount. Then it stopped squealing and is the best running it has been since February last year! Now, if a hub that can fix itself is shit, I want the hub your running!