Have you tried using a pair of needle nose pliers and see if you can grip em by the sides of the heads? May be a pain but I have been able to get a few screws worn out like that this way..
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-D Modifying and Tweaking is a journey, not a destination................................ MKIIa : 60gig - 040103286 - Blue - v2 + PCATS tuner MKIIa : 20gig - 040103260 - Blue - v3a8 + Mark Lord Special Edition Cherry Dock