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tangor - 10:41 am on Nov 7, 2009 (gmt 0)
You next communication with client is: "Failure to complete. I'm using this for another project. Hope we can do business again." And do it. Meanwhile, if they aren't totally stupid they will say "No! Don't do that! Etc." and you say "$4000.01" The Penny is for your trouble.
You made mistakes upfront. Know that. Don't do it again.