How do you rekey an ignition lock?

To rekey an ignition lock, first, remove the ignition cylinder from the vehicle using the appropriate tools. Next, take apart the cylinder to access the pins and springs inside. Replace the existing pins with new ones that correspond to the new key you intend to use, ensuring they are of the correct size and shape. Finally, reassemble the ignition cylinder and reinstall it in the vehicle, testing the new key to ensure it turns smoothly.