Anybody ever had your wet grinder stone to spontaneously develop a crack? I noticed one on mine the other day going straight from the shaft to the perimeter. It hasn't affected its sharpening ability but I'm concerned at some point the crack will finish its trip across the wheel, forceing me to replace it before I've gotten my dollars worth out of it. Since CBN wheels are now available for wet systems I'll probably go that route. It just a bit annoying as nothing has happened to it I know of to cause any damage other than old age.