I have posted this on other forums, so forgive me if you have seen it before. I use home made clamps to secure sections when soldering. I make my clamps from sheet stainless steel, available from many sources, but I get mine from eBay.see; http://www.ebay.co.uk/itm/stainless-...8#ht_500wt_969
I use a piercing saw to cut strips from 0.9mm. thick stainless steel sheet. The strips are 4mm. wide and 100mm. long. Then I file the strips clean and bend them into shape using pliers. The photo below shows the shapes I make and some of their uses during soldering.
James
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