I was dadoing the back of some molding & hit a staple so that set off the break cartridge. Put a new one in and started to finish what I started & I set off another dado cartridge. In doing that it ripped about 12 teeth off the dado blade....So a new Freud 8" dado blade & two dado cartridges...I'm going to send the one back that didn't hit anything to see what they say.....