I have a Luxus Model A Electriscreen installed in the ceiling between two floors. I need to adjust the fully extended drop of the screen by quite a few inches (up). The manual shows a down-limit switch on the left of the screen which I cannot see at all - it maybe obscured by the ceiling. Is there any other way at all of adjusting the screen (I have the IR box option as well). I have full access to the top of the screen via a hatch in the floor above. Thanks.