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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

I've seen many locks get finicky after years of use, and key blade wear is a big reason why. As the metal on a key's teeth gradually rounds off, it can't properly lift the tiny pins inside a lock cylinder. That often leads to a stuck key or a cylinder that feels gritty when you turn it. For ignition switches, this wear can cause intermittent electrical contact faults or even make the switch jam, leaving you unable to start the car—something a new key might fix for a while.