If you don't have extractors,you can try these different procedures....
Take a look at these links :
[http://www.wikihow.com/Remove-a-Stripped-Screw|Remove a stripped screw]
[http://www.todayifoundout.com/index.php/2010/02/the-12-best-ways-to-remove-stripped-screws/|The 12 best ways to remove stripped screws]
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