I would pull out the hand crank from the tool pocket and see if you can manually get it to properly close. Mine has some stripped teeth or something and would also rattle over bumps. A little block of wood between the glass and my roof crossbar Solved the rattle but I still need to take it apart and fix the initial problem.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)