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@gbj_tester
Holding a dynohub in your hand is going to feel clunky, the magnetic poles cause the resistance to vary in a wave pattern around the rotation. Put it in the frame and give it a spin, that will tell you more about whether it's really dodgy or just typical for a dynohub.
Also, even properly adjusted bearings can feel tight in the hand, since under service load they will have several hundred newtons of radial load, which opens up the clearances on most bearings.