Just tried the paperclip method. Glue the tip, insert into the small hole you should be able to see. Hold for a few moments to ensure that the glue is binding and then leave for a bit. I was really sceptical about this trick, but I left the iPad, made a coffee, came back and pulled the remaining jack out without any effort at all. Just make sure you get enough glue to get a bond but not so much that it spills over and glues the jack in. I put my paperclip in the tiny superglue tube.