Once I got all the tubes in I had a thought. Back to the "pile" I went..Came out with a broken center drill with a nice 37 degree taper. Cut the tubes about 3/16" above the top CR and along with a plastic mallet and a steel backer block did some good ole fashioned Peening. Turned out pretty damn good, they're actually in tension (sound like guitar strings) and nice beveled edges for easy care and feeding.
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