I originally had a TTOne that used a slotted adaptor so my new 530S isn't compatible. I have found several mounts that appear to just replace the stock mount and connect to the easy port. I found this one: EPCHGSM: Adhesive Dash Mount for TomTom One 125/130/130*S/140/140*S; XL 330/330*S/340/340*S, XXL 530/540 - TomTom One 125/130/130*S/140; XL 330/330*S/340, XXL 530*S, 540*S Mount which I think would work great with my car mount but I am concerned that the swivel doesn't have a knob or anything to tighten it up. Has anyone used one like this? Did turnanything up in a search.