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Mornin' Truck. No problem with your terminology. While not an expert, I do know how it's installed. Did a good-sized copper one on an outbuilding here last spring by myself. The pans go up one at a time. You'll have to separate each pan by unfolding the seams. Cleats are the L shaped pieces double-folded into the seam and nailed to your decking. They're installed on the upturned pan edge and nailed to the decking before the adjacent pan is placed there. Then you use seamer(s) to double-fold the seam. Couple of choices. Today, most roofers use a hand operated seamer to fold, but that requires a special formed edge on the pan. What I used and was typical in your time frame was to form pans with a simple lip on each side, one 1/4" higher than the other. Foot seamers, or "stompers" then go down the seam folding it over. Takes a matched pair. There's also a hand seamer, which is an iron you use with a wooden mallet which helps the foot seamers. Much easier to do than describe. But the short answer is you need some tools and a tiny bit of advice using them. I borrowed my tools from a retired roofer, who also spent a short amount of time getting me started. The seamers self-align so it's difficult to screw up. If you don't have enough purchase for your cleats in your roof decking, you'll obviously have to fix that first. I used 2 nails, toe-nailed, on each cleat. Live on a mountain here, very high winds, no problems with my nails holding in the tulip poplar I used for purlins. The most common reason for cleat failure (the only things that hold the roof on) is not using enough of them. You needed more. Mine are about every 18". Cleats are made from scrap pan material and pre-formed on a simple bender, usually homemade. Pretty sure I wouldn't try to reuse your pans, but use new material instead. Far easier and the metal isn't very expensive. If you can't find pedal seamers to borrow, a hand iron will do it, just a lot more work. New ones are $25 or so from a roofing supplier, plus you'll need a good wooden mallet. That's after you get the pan edges bent, usually using a pair of pan tongs with pins that align them, but as long as you get about the right lip, doesn't matter what you use. Let me know if some photos would help you. Don't know as I have any from using the seamers, but I can show you a cleat and the bender. Also a drawing of how it all goes together if it isn't clear from your unfolding one of your seams. Not complicated at all.
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