How It's Made S21E10 · Customized Knee Replacements, Leaf Springs, Lavender Essential Oil, Rivets and Rivet ToolsCustomized Knee Replacements, Leaf Springs, Lavender Essential Oil, Rivets and Rivet Tools

Medical scans and computer models guide the production of customized knee-replacement components designed for an individual patient. Steel strips are cut, heat-treated and curved into vehicle leaf springs; harvested lavender is steam-distilled to extract its essential oil; and metal blanks are formed into rivets alongside the tools used to install them.