Push-to-Start Shower

Our showers have the odd washer-like pullout that starts the shower head. A lot of people seem to be very confused with this design, so I've designed a nifty little push button to eliminate the confusion. The next project is a Setup Sheet for the temperature control... It's one of those coarse-fine controls.
http://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Dtools&field-keywords=dual%20control%20shower&sprefix=dual+cont%2Ctools