Rolling ring linear drives have a thrust set screw preset at the factory. It applies pressure (preload) to the rolling ring bearings so they maintain constant contact with the drive shaft. This assures accurate thrust and prevents backlash. When the free movement lever is actuated 90° (manually or pneumatically), the thrust set screw pressure is released and the linear drive is easily pushed, in either direction, to any location along the shaft. This eliminates the need to start-and-stop, or “jog,” the system to position the linear drive.