Key blade wear and its effect on lock cylinders and ignition switches

https://ace-wiki.win/index.php/Key_blade_wear_and_its_effect_on_lock_cylinders_and_ignition_switches

When you use a worn key day after day, the blade's edges gradually lose their sharpness, and this damage transfers directly into the lock cylinder or ignition switch. Over time, the wafers and pins inside become scratched and misaligned, making the mechanism stiff or unreliable. You might start noticing the key sticking, turning unevenly, or failing to rotate fully—a sign that both the key and the lock are wearing each other out faster than they should.