If you operate the top to a half closed position, look from the inside of the car and locate a torx bolt near the top of the rear glass. The torx bolt secures a black adjuster for the top. Loosen the torx bolt, slide the adjuster down one tooth, tighten the torx bolt, and test drive the car. If that doesn't correct the problem, try repeating the steps. You may have to slide the adjuster in the other direction. My 06 SLK350 had a rattle behind the passenger seat and this corrected it. I own and operate an Auto Body Shop and have tried several things to correct this problem. This is what corrected my problem. If you have any questions, feel free to email me at
zeigler@mchsi.com or
dfz_1970@yahoo.com.