An interesting "feature" of the iMac hockey puck mouse is the ability to secure the mouse ball. Lab instructors in schools love being able to secure their mouse balls because of the tendency toward mouse ball theft.

To secure your mouse ball in a puck-style mouse, look for the hole in the ball retainer ring. You can use a Mac tool in this hole to press open a latching mechanism which will allow you to rotate the retainer a couple of millimeters further clockwise. Releasing the latching mechanism and removing the Mac tool effectively locks the ring onto the mouse, making theft more difficult.