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6.The easiest way to cut out a particular shape is to make a template using 18-gauge sheetmetal. After you trace your pattern and cut it out, tack 7/16-inch nuts around the edges. When the template is flipped over, it makes it much easier to pull the plasma around it, since it stands up off the surface of the metal that you're cutting. This gives the head of the plasma a surface to rest against as you drag it along and will yield much cleaner cuts.