I bought a pair of HE-500's off the classifieds here in December, and they've been fantastic. The sound is so clear and crisp...words just fail me. But I've run into a problem. (I don't know the technical names for the parts, so please bear with me.) The right nub that holds the right can on has cracked off (see pic). The right can no longer stays with the phones. I tried super-gluing it back on, but it fell right off after a day. Any suggestions for fixing this? I'd hate to give up on this pair of headphones so quickly. Unfortunately, I'm not much of a fix-it guy. Thanks guys!