I'm not an experienced bike mechanic, just a rider who does occasional minor work on his own bike, so I apologize in advance for this probably dumb question.
So, I was about to remove my stem today (threadless, 1.125"), to place it a little lower on the steer tube, below one of the spacers.
As I try to unscrew the top cap, I notice that the bolt head keeps turning and turning but won't go out. As I do this, I hear a scratching sound from within the steer tube. I turned it the other way and the same thing happens. The bolt just turns and turns. Doesn't come loose, doesn't tighten up.
is the starnut broken? I'm thinking I may have stripped it by tightening the bolt a bit too hard the last time I replaced my stem.
What are the dangers related to this? Could my stem pop off at some point, while I'm riding? I gave it a few sharp tugs upwards but nothing happened. Would I need a new headset? Could I just take it to a local shop and have them remove it somehow and replace it with a spare starnut?