I'm trying to remove the plastic trim on the trunk lid on my 2001 W210. This thing is held on by 3 screws.. but on my car, I see 2 screws on the ends, but in the middle there is a flat bolt, with nothing on the head to turn it, instead of a screw!! therefore i cannot get this sucka off. how the heck am i supposed to remove this thing????? argh

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Current cars:
2001 MB E55 AMG
2003 Honda S2000
2000 Honda CRV

Gone but not forgotten:
2004 BMW 325i 5sp sport
1999 BMW 540i sport
1997 MB E420
1995 BMW M3 coupe