Product review (3 stars): Fast Shipping, But Part Seems Expensive For A Couple Pieces of Plastic
I was replacing the bearings so figured I would replace hub also.  The inner white piece is pretty loose when set inside outer hub piece.  I just used the grease that came with the bearing kit and applied grease between all the teeth (on both pieces).  That created a tighter fit.  The original hub seemed fine, so I'm hanging on to it just in case.