How to replace the lock tongue of the old security door

Remove the upper and lower locking bolts of the security door? Open the door lock cover and loosen the screws on the lock. There are two small springs above and below the screw, which are hooked on the lock tongue. Remove the spring and the lock tongue. Open the door lock cover and loosen the screws on the lock. There are two small springs above and below the screw, which are hooked on the lock tongue. Remove the spring and the lock tongue.