Drill a hole through each set screw and use some penetrating oil, then use an easy out. Not the spiral ones. Get the ones that are square and tapered with 4 biting edges. You can buy single sizes, you don't have to buy a set.
Like these:
http://www.matcotools.com/catalog/product/SE25/5-PIECE-SCREW-EXTRACTOR-SET/
Like these:
http://www.matcotools.com/catalog/product/SE25/5-PIECE-SCREW-EXTRACTOR-SET/
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