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How do I remove my old arial base, on my 2010 Ford Ka Studio?

I have a 2010 model, Ford Ka Studio, and the old arial base is missing its cover. So I've bought a new base, with a male screw thread, from my local Ford dealer. But I haven't got a clue how to remove the old base! Can anyone help?
Jules Hunt, May 2012
link Click here to see other fixes for Ford KA.