I was told today by one of the local airport hangouts, that there was a problem with Ayamr-Demuth propellers. A certain run of them had balance problems, or the way they were balanced. There was some kind of advisory on a certain serial number range? I'm wondering if anyone has heard of this. My propeller is kind of old now but never been flown. I'm almost ready to fly and am thinking about the prop. It's a 68?D X 78?P and the serial number is 92378. Thanks for any input.