Revised version with larger and correct number of teeth and slightly shorter arm to fit tighter. If you have one of the first generation Contour Rotating Mounts (thicker than the current rotating mount), you can disassemble it and replace the mount with this piece. then reassemble the mount. Contour's rotating mount has a LOCK button and firmly locks in the rotated angle. It is a flat surface Mount. The current rotating mounts are not meant to be disassembled and cannot be converted. IGES & SAT files included for modification.