I really think even if you sandblasted those surfaces the first few times you turn it is going to go right back to the surface you have now. As long as the "cones" aren't bottoming out you should be good. If you are interested in more "locking" action you could shim the load springs. But even with that, most of the locking action comes as a result of the load on the spyder/axle gears when one side wants to slip. Good luck!