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When you sharpen tungsten rod you want to sharpen with the length of the rod and not sideways. If not done correctly the arc will be unstable and wander. Also make sure to sharpen your tungsten as if it were a pencil. (Left) not sharp enough, (Middle) this is about where I like to sharpen my tungsten rod, (Right) unless you are doing very thin material stay towards the center tungsten rod sharpness.