What is the proper technique for assembling the seam of a 3" x 6' sheet metal vent pipe? I'm assuming you start by inserting the lip at one end into the slot and then work your way down the length, but that simple description does not begin to be easily accomplished in practice. Is there some additional technique I need to know about, or a tool that helps?I've also tried rolling the tube into a tighter radius but that is not easily accomplished either.
John Keith snipped-for-privacy@juno.com