happens to the best of us. forum recently had at least 3? threads on removing stripped bolts of some kind. you can try a small left hand drill bit. it will bore into the stuck screw & at a certain point it will unscrew the bolt. if it doesn't & you wind up drilling all the way thru or deep enough you can use a left hand screw extractor inserted into the hole you drilled. with both tools the rotation is counter clockwise