The latch (locking the seat to the frame rails) on the rear bench in my Eurovan Winnebago seems to have two operating modes: (1) quiet, but so tight that you can't lock/unlock the seat, and therefore can't convert from bed to seat or back; and (2) loose enough to operate the latch, but also incredibly loud rattle above 25 miles per hour.

I'm thinking that a plastic washer between the screw and the latch mechanism might be slippery enough to allow the latch to operate, but be tight enough to prevent the dice-in-a-tumbler sound.  Anyone got a better idea?