I am trying to pull some wood shutters off vinyl siding. The screws are placed into what looks like a cylinder (I believe it is called an "anchor"), which itself looks attached to the siding. But when you get working on the screws, instead of coming out, they simply spin and make a popping noise every once in awhile. How can I get these shutters off?
Note: This is not simply one isolated screw; none of them will come out on any of the shutters. I have also put a crowbar behind the shutter to pull it from the wall so that the screw would "catch", but that didn't work either.