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If you ever have worked on cars, you have experieced a rounded out allen bolt head. Allen bolts get rounded out because
a) All the crud inside the bolt head wasn’t removed before attempting to remove the bolt
b) The Allen wrench wasn’t completely perpendicular to the Hex head
c) The Allen wrench being used is rounded out (Bad tool)
d) Not enough force was used to keep the Allen Wrench inside the head.
Either way, your hosed. Here’s the easiest methof of removing that bolt.
Same procedure works for hex head bolts.