I wasn't aware of the Acousticon 220 Series. I did know about the 316 and 516 Series. Simply put, the shells were 3/16" and 5/16" in thickness, respectively. I'm not sure what the thickness of the 220 would be, but obviously thin enough to cause that collapsing bearing issue. Bummer!-Mark
Yeah, I am pretty sure the 220 series was even thinner. It sucks about the snare but I wasn't really going to use it anyway...more of a collectors piece. I do really like how the rest of the kit sounds and I'm not really worried about them collapsing since I tune pretty low D' Drummer