Help help! Our basin has or HAD one of those pop-up plugs, but we took it out because it never popped properly, and took the screw bit off to fiddle with, so there was just the plug bit. My dad has put it in the basin not realising and it is STUCK. I can't prise it out of the hole. This happened once before and I can't remember how I got it out, I can't find anything thin enough to slip between it and the basin hole. Any ideas? I have tried tweezers, a pin and my fingernails so far...