The long transparent bolt is necessary when you attach the Lightswing® not directly to the ceiling, but to the mounting ring. The mounting ring provides more distance between the ceiling and the Lightswing®. To be able to adjust the Lightswing® properly along the ceiling, you also need a longer bolt that bridges this distance between the Lightswing® and the ceiling. You can easily remove the short bolt from the Lightswing® and replace it with the longer one.