Thanks guys, went to Sears and bought a rotohammer but it failed to loosen them up, now I have a hex bolt that is no longer a 8mm, rounded off inside.

Does the bolt remover jeffoc mentioned works on hex bolts, they are smooth on the outside, I can't imagine a tool that works in such a way. Let me know what the tool is called if you remember.

I may have to try the 12 point star hammering to fit approach that samiam4 mentioned. I was thinking about hammering a 9mm hex but that is pretty impossible.

Thanks

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Thanks, Juan