Quick Overview
For every turn the big gear takes, the little one turns twice. These gears are designed so that one can snap-fit a single .25" neodymium magnet into their centers. They also permit the wearer to casually throw around the word "neodymium" at parties.
A second magnet on the opposite side of one's vestments will hold the gears in place. I recommend using these magnets:http://amzn.to/1oWX7OJ and the Space Age adhesive of your choice.
Will not damage clothing and may actually enhance self-esteem.