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...oh, and be sure the wet rags touch the metal, not just the rubber, or it could melt from the inside-out...

One method I use to keep something from melting while I weld/braze/solder next to it, is to place a water-soaked rag or two over the part I want to stay cool. I learned it from building and repairing brass models which are soldered together... As assembly of the model progresses, there is a...