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Thanks for the reply. I put the ball peen hammer on the rim of the tube and tapped the flat end with another hammer. I put it on the rim of the flare so as to only have the one side curl over. I ended up tapping my way around half the tube. It wasn't pretty. I decided to try again because the flare was not even - a little wavey- and I questioned whether I had a good seal. I am less concerned about how it looks as long as it is sealed properly. I don't mind if I have night of trial and error ahead of me, once I have it figured out I will know what do next time.

Thanks