I Have a 120 inch 4:3 Draper Luma (non tensioned) screen. When I view my front projector in 4:3 it fills the screen. However, when I watch a 16:9 movie the grey bars at the bottom are annoying. Any suggestions on masking it. I really don't want to spend teh big bucks on a motorized system plus I don't think you can do that without a tensioned screen. Thanks.