There is two people above that call it a wheel bearing issue. Your wheel is flopping around and you think the center section should hold it in place? No, that is a wheel bearing issue, and you just can't have it set right if its tapered bearings. With the wheel flopping around like that, there actually would be very little movement in the center section, not an exaggerated movement. AND, there is nothing in the center section to hold the axle in, that is done at the wheel bearing. Good luck with this.