Please advise me on what to do. While attempting to adjust my headset, the aforementioned nut appears to have lost its grip on the inside of the steerer tube. Now, I can neither undo the adjusting bolt, to remove it, nor tighten it to adjust the pre-load on the headset. Rotating the bolt on the top cap just spins the star inside the steerer tube.
What is the best way to remove the bolt, and then tighten the nut?