 it will show up because the dust will stay embedded in that split or crack if it's too small to be obvious. But a lot of times you just start tracking them with your fingers as you're wiping stuff off and say, oh, I've got a quarter inch gap here. Oh, I've got a half inch gap there. And then you know what you gotta replace. That's true. Tom, a whistle might be kind of hard to locate though. I would think even it's so tiny that would make a kind of a sound.