Oddly enough i had the same issue with a set of forks, I assumed it was at the joint between the alloy and carbon meeting, decided not to use them to be sure, then destroyed them before chucking them away.
After cutting them up I noticed the crack wasn't exactly where the two materials met, but there must have been enough flex in the blades to crack the lacquer and the carbon at that point, so still not worth it -
I think the moral of the CSB is you never really know whats going on with carbon unless you X-ray it, so always better to be safe than sorry
Oddly enough i had the same issue with a set of forks, I assumed it was at the joint between the alloy and carbon meeting, decided not to use them to be sure, then destroyed them before chucking them away.
After cutting them up I noticed the crack wasn't exactly where the two materials met, but there must have been enough flex in the blades to crack the lacquer and the carbon at that point, so still not worth it -
I think the moral of the CSB is you never really know whats going on with carbon unless you X-ray it, so always better to be safe than sorry