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What is the real purpose of this little hole?
When making a safety pin, the spring—the coil that gives it flexibility—must be wound with extreme precision around the pin. This requires a stable anchor point.
This is where that little hole comes in. It allows the machines to guide the thread during winding, calibrate the spring tension, and ensure the pin remains effective, opening after opening. The result? A reliable closure, lasting elasticity, and exceptional durability , even after years of use.
