How large is the head? I have good luck using a hammer / flat punch that is about the size of the allen head and hit it square on the bolt head a few good whacks. This should form the "hex" back to where its possible to get the original allen size to fit correctly and it'll come loose. Kinda hard to explain but this works 90% of the time at my job as we only use allen head bolts.
Is this on your bow?
Is this on your bow?
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