Mine just came up and off. You may have to wedge a flat-head screwdriver in there to pry the top from the bottom. Or you can spray with a penetrating oil to loosen it up some before you go and destroy it. 
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1982 Porsche 928, Auto, 4.5
http://i72.photobucket.com/albums/i166/hethaerto/928Mist2.jpg?t=1305333945
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