Sun visor doesn't stay close to windshield
 

Both my front sun visors have had this issue since new: It doesn't hold its position when angled near the windshield; it droops down away from the windshield within a few seconds of driving. It will only hold its position when it's closer to vertical. This is quite annoying for me because everytime it swings down, it covers most of the view of the road. Has anyone disassembled it to see how it can be made to "grip" when placed closer to the windshield? Thanks.