Got it. Now, I just discovered something odd. When I shake my 561 (don't ask me why), I can hear a slight sound as though something is loose, but I can't figure out what it is. Does anyone else's make that sound as well? It sounds as though there's a sand grain stuck somwhere, but there can't be, because I don't carry this out anywhere, nor can I think of anywhere where it might get stuck in.