I bought a nice Craigslist find this weekend, a Cross Check with a Chris King NoThreadset. Anyway, when I took it home I noticed a fair amount of play in the headset, so I decided to tighten it. I loosened the stem bolts first, and then started to tighten the cap bolt, checking the play with every half turn or so. Anyway, I wasn't noticing any improvement in spite of the cap bolt getting tight, so I (probably foolishly) kept turning, and then I heard a snap! Now the cap bolt can be turned indefinitely without getting fully tight (it will appear to get tight and then a quarter of a turn after that will bring it back to being loose), and of course there's still just as much play in the headset. So my questions are: what the hell was going on with the headset in the first place that the cap bolt was tight without a corresponding reduction of play? And did I break the star nut? How should I proceed?