Originally Posted by
matimeo
I don't get it. The entire cog on the cassette came off? How can this happen without taking off the outer cogs? Or did the teeth somehow strip off? Either way sounds like a freakish event and a seriously defective part.
It appears that the cog was held to the cassette as they usually are, but the supports snapped (presumably each support breaking was one of the mystery bangs), and then it snapped into at least 2 parts. I certainly didn't hear any metal hit the ground (and I don't wear headphones), so I'm going to look for the missing bits tomorrow when I go back to school.