I want a LEGO part that does this...

If you've seen my work area in the past 8 years or so, you know that I'm working on an alarm clock casing. I've uploaded photos of one of the knobs in hopes of somebody recommending a part that can replace it and interface with the electronics. Brickshelf: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=335784