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Explained Medical Science on Instagram: "Handcuffs are simple-looking, but inside they use a smart mechanical locking system designed for control and safety. 🔹 1. Ratchet Mechanism Each cuff has a curved arm (called a pawl) with teeth. When the cuff is closed, the teeth slide over a ratchet, allowing it to tighten only one way. 🔹 2. Spring-Loaded Lock Inside the cuff, a spring pushes a locking bar into the ratchet teeth. This stops the cuff from loosening unless the lock is released. 🔹 3. Key