We've had an attic fan that vibrated so much that it rattled the teacups in the family room. I climbed up there yesterday, pulled the cover and removed the fan blade. I placed it on my MM1000 blade balancer and it swung quickly to the heavy side. A few passes with a hand grinder and it came into perfect balance. After reinstalling it, the china is now safe and the vibration is gone. I sure like this tool!!