Tile Lippage Control System: Achieving a flush surface from one tile to another has never been easier. With the Spin Doctor Lippage Control System, you can spin the leveling cap down with ease to the tile surface in seconds. Other systems require tools, use of both hands or awkward repetitive motions which can cause user fatigue when installing large format tile. The Spin Doctor System uses a fast and precise free spin action that will accommodate most tile up to 3/4” (20mm).