I had issues as well once, but my cowbell took care of it.
The guy really took care of me, and explained the supplier challenges he had. Apparently, he gave his supplier grief - explaining that his customers would not stand for inferior bells or clacker issues. Seems he has rectified it.
IMO, his service was outstanding. He jumped at the chance to "make it good with me", and I can't imagine he wouldn't do the same for others. I have bought many (gifts, my collection, and so on) from mycowbell - even since he was running Cowbell Central. They have all been good bells, so I am thinking he just ran into a slight snag. Have to think that might happen from time-to-time no matter the product.
Anyway, I like getting bells from mycowbell.com and will continue to do so. At least if you DO have an issue, this guy will answer you and take care of you. And personally too.
Go Dawgs. Beat Michigan. And please................more cowbell!