Originally Posted by BrandoAU

Most issues with these are with loose glass. Slide back your shade, remove the rubber cover on whichever side is loose (if glass). You will see the screws to tighten up front or near the rear. Just tighten them up, but don't over tighten. Pop the rubber accordion covers back on . All done. If you can move the glass but the case is tight, I think this may be your issue. I did this on mine a few months ago.