Great info Dr. d! Normally I do any beading I have to on a Pexto rolling machine, but most people don't have access to a full sheetmetal fabrication shop. The only thing I could think to add is to press the bead in about 3 passes applying a little more pressure each time until you get the full bead. It stretches the metal a little more evenly (important if you end up using thinner pipe), but that's just my sheetmetal background being a little anal. Still a great how-to for the community though and should provide nice results either way.