I just adjusted mine. I disconnect the vacumn lines and adjust the alignment and springs so the lights stay closed at rest. The spring tension holds them down from the back side at rest. If you force them open the springs relax and then apply pressure again at open. The actuators only work during the open/close call from switch to overcome the springs. I had to bend my spring stems slightly to offset the loss of tension from their age. Once adjusted to stay closed at rest, re-hook your lines. Even if the vacumn leaks off the springs should hold the lights closed.