a lot of folks don't seem to know about welders "spoons", copper plates with a handle, or a piece of copper pipe hammered flat. They are used when filling a hole in thin sheet by putting the spoon behind the hole and welding over the top. The copper supports the molten weld puddle and soaks away the heat, but the steel won't stick to the copper, so its easy to fill up a miss drilled hole, or for modding panels.
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