I looked to see how much room I had to shave off based on where the locking ring would bottom out. I only had a half mm to take off and I determined that I would not bottom out the locking ring on the hub race if I was careful to take only that 1/2 mm. Bottoming out the ring would leave no torque on the rotor. I did not need too many passes over the flat table with emory cloth to take down that aluminum collar a half mm. Because the splines would help keep things in alignment, I was not concerned with precision within a few thousands. I almost took too much off the front though, because I only got a couple clicks of the locking ring before it was fully torqued. That did the trick. Thanks for everyones input.