Many viewers have asked about the giant Swiss Army Knife replica that lives above the lathe in Adam's shop, and Adam takes this display down to the workbench to show you exactly what it is and how it works. And while it's disassembled, Adam spends the day making a replacement blade to restore this prop to its full multi-bladed glory. Be prepared for some fun maths!

Shot by Adam Savage and edited by Gunther Kirsch

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