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Work continued until the majority of the creases had been removed, and then as luck would have it, the bottom-most crease had a single area, which was so thin that a tiny bit too much heat combined with the higher air pressure resulted in the metal rupturing. Note that this shot was taken immediately after the metal blew through. The hole will now require a patch weld. If this is beyond your skill set, a local shop should be able to handle the job.