So... I'm riding to my parents house in the suburbs last night. As I approach an intersection I see that the light is green, but has been for a while, and thinking ahead, I don't think i'm going to make it, so I try to skip to slow myself down. Well, as soon as I apply back pressure, everything goes loose. I'm using a track cog lictited onto a non-track rear hub with a bb lock ring holding it there. This hasn't created any problems for me in the past. My first instinct is that *****, the cog came loose. I then decided to go faster in order to make the light, and then stop afterwards. Well, the cog fails to engage, no matter how hard I pedal. I end up flying through a red light, fortunately avoiding all cars, and stop my self with my foot on the tire. I get off to find that the cog and lock ring are still in place, but that no matter how much I spin the cog, I cannot tighten it back onto the hub.

I still can't even get the cog off of the hub, but I think this is because the threads on the hub are completely gone, and the metal scrapings have jammed inside of the threads on the track cog.

Has this ever happened to anyone else?