At one time or another, most of us have looked down at our hands wondering where the grease ends and that fresh blood begins, and muttered angrily, “Are we having fun yet?”

Buttsn runs a repair shop nearby and always has something interesting going on. Today was no exception. “C’mon out back,” he smiled. “I have a little project I want to show you.”

The squeal itself is caused by a pad that’s vibrating back and forth very rapidly. To human ears, this vibration’s frequency sounds like a squeal.