I bought a tomtom XL 330s, and since I live in Calif I can't mount it on my windshield (Not that i'd want to anyway). Anyways, I've been trying to make my own vent clips, but they still incorporate the suction cup, and I don't want that. So I had this idea to take apart the easymount kit (http://www.tomtom.com/products/accessories/accessory.php?ID=553&AccessoryCategory=5&Tab=0), since it has a ball joint, and rig this; http://www.mogiz.com/pages/productdetails.aspx?productid=14WW in its place. The only problem is that I can't tell whether the balls are the same size. I measured the best i could, and came up with a 15mm diameter. I don't know how accurate this is... and from google searches I believe that the diameter of the garmin mount is 17mm. i could be wrong. Has anyone tried this? or have any opinions? Or more importantly, does anyone know the actual diameter of the ball on the easyport mount kit?