I haven't seen any recent posts on this so I'm hoping someone might have a solution. I've got my crossbars out right now so I can carry my kayak this summer, and of course when you pull the crossbars out to use them, it leaves a hole that was previously hidden when they they were tucked into the side rails. I know water will drain out of these holes, but I have trees in my driveway that will dump leaves and pine needles and acorns, etc. in these holes. Has anyone found a way to plug these holes and prevent crap from getting in them? Thanks!