Welding gas cylinder valve cap with indicator
thingiverse
This is a simple drop-on cap for welding gas cylinders (argon, C25, etc) with 5-point knobs. It provides a simple visual indication of whether the valve was last turned clockwise or counterclockwise. demo: https://www.youtube.com/watch?v=fYlOAg2nk7M Apply bright paint, reflective tape, nail polish or whatever to the grooves on the inner piece as indicators. Use a wood screw with washer inside to keep the halves together. You may wish to add a ring of cloth, felt or something between the two pieces to provide a small amount of friction so it holds position if inadvertently nudged.
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