Last Updated Dec 19, 2008 10:17 AM EST
All you need for this project is a piece of 3-inch PVC pipe, a pair of pipe caps, a flat-head bolt, and a nut and washer (all told, probably a couple bucks' worth of parts at the local hardware store). You also need some tools and about 20 minutes of spare time.
Definitely a neat little project, though I have concerns about the end result: Having a GPS at eye level is distracting enough, but mounting it down low strikes me as even more unsafe. Every second you're looking at the screen is a second you're not looking at the road. So be extra-careful out there, please!