This is continuous stabilization, used when the façade does not have, or lend itself to, built-in guide tracks. Installed on the building are permanent, or removable, guide buttons, WGS #200 Series and the WGS #299 is mounted to the platform.  As the platform travels up or down the building, the track and its attached platform are always in contact with at least two buttons and, for a moment, when the track passes a button, a third one.  For removable button installations, the buttons are snapped in on the way up and removed on the way down.