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How to Properly Replace a Keycap The key will begin to jiggle frequently when it is approaching its end of life. Replacing it will allow the key to function smoothly and avoid any unexpected lockouts or damage to locks or ignition systems. Recognizing the issue and using the right tools is essential for a successful key repair. Disassembling the key properly and cleaning and lubricating the switch, and re-aligning the key will resolve many issues. Keycaps The plastic shell that covers the switches