Works perfectly. It seems many people can't follow the instructions even if there are pictures. O-rings are not placed on the thread of the gas lens, they go behind the thread. Align the gas lens in the cup with the white ring and screw on. Of course it will move if you hit it on anything, as will ALL Pyrex cups, even those that cost $50-$75 each. Come on guys, that's common sense. If you do not know how to weld a TIG, and you need to draw a cup, buy a ceramic filament.
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