Originally Posted by TeamSkunkwerks

Have a set of these myself. Might work for you too!!
http://www.harborfreight.com/12-piec...set-40349.html

Also might try using JB Weld or epoxy & actually bonding the wrench (use a cheap Allen if you have one) to the screw. Let it sit overnight to bond. Then slowly try to back the screw out. Could also use heat to try to break the bond.