Has anyone see a mounting adapter that will let me attach a GO 720 / 920 / 730 / 930 to a Garmin ball? I have a Garmin mounting ball (goes into the back of StreetPilot Cxxx and Nuvi Mounting cradles) on my dash. I'm interested in picking up a 930 once they're available here, but I need an adapter to mount it to the Garmin ball. I'm thinking a simple socket for the Garmin ball attached to one of those plates that slide into the back of the TomToms.