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W1N9Zr0: Table axis thread, very non-standard
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W1N9Zr0: 20 TPI, double start, 3/8", square thread!
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W1N9Zr0: Printed two versions in ShapeWays WSF
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W1N9Zr0: Replacement nut, testing repeatability
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W1N9Zr0: OpenSCAD model of replacement nut