I just had this problem fixed on a carbon frame. My attempt to fix with epoxy failed - popped right off under load. I found a great guy here on the east coast that did it properly - Carbon State Repairs, LLC . Highest recommendations I can give on him, Tom, and his work - does all kinds of frame repair, but only frame repair. Now, if you're on west coast you probably don't want shipping costs. I did a web-estimate with Calfee, but it was beyond my budget. Mine needed to be "re-riveted", filled, prepped, then done with some totally bad-ass industrial epoxy, not mortal human stuff. First time I ever saw a double barreled caulking gun.