I have an 08' 400ex, and have some issues with the rear brake rotor and axel lock nut. The rotor has almost an 1/8 of an inch of play both left to right and up and down(i tried to tighten the allen bolts that hold the rotor to the hub, they are tight), and the axel lock nut and "collar" (the piece to the left of the nut, w/e it may be called) have a bit of play as well, yet they are not loose enough to be spinning on the axel. Both the nut and the "collar" are moving, but they are still together, with no play in between each other. What could this be? axel bearings? bad threads on the axel?