I have a 1 inch threaded Campy Record headset, and have discovered that the spacer under the locknut has become threaded. The 4 mm thick spacer has 4-5 threads in the tab which fits into the groove in the fork threads. When I tighten the headset, it turns. And the headset now loosens on me regularly. Obviously I need to replace this spacer with one that stays put. Just wondering if anyone else has seen this happen and how common it is. Maybe this explains why threaded headsets are no longer being used.