How do you replace a ignition cylinder on a 2004 Harley Sportster?

To replace the ignition cylinder on a 2004 Harley Sportster, first disconnect the battery to ensure safety. Remove the ignition switch cover and unscrew the ignition cylinder from the switch assembly using the appropriate tool. Insert the new ignition cylinder into the switch, secure it with screws, and reattach the ignition switch cover. Finally, reconnect the battery and test the new ignition cylinder to ensure it is functioning properly.