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A few minutes applying a tool to material I have on hand made the problem Go Away
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Laser-cut acrylic may be too brittle for the job
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The forces from the triangular teeth on the rotary ring tend to jam the knob against its pin
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Programming by successive approximation may be a thing
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When that happens, the projector is boresighted on the spindle
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As the man said, “E pur si muove.”
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The nice engraved letters come from scribbling a chisel-tip black marker
The Smell of Molten Projects in the Morning 