I got my mount off ebay back when I had the droid, & love it. Searched for "droid bike mount". There are several different models, but I like the one I got cuz it has ratchet pull tightening system for varying sized handlebars with a quick release (no screws involved). And same for the ratchet side clamps that hold the device in place. They are foam padded to keep the device snug and secure and not scratch. The sweet thing about it is that it was easy to take right off the bike and strap it to the atv and go. Can 360? rotate and tilt too...
The only thing I can't remember at the moment is if the left clamp got in the way of the charging port on the DX (was fine on droid) (able to charge on the atv).
http://cgi.ebay.com/Bike-Motorcycle-Handlebar-Mount-motorola-droid-/320567191482?pt=PDA_Accessories&hash=item4aa34b27ba
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