Old-fashioned door lock, how to remove it?

First, you need to remove the panel of the anti-theft door lock with a plum blossom screwdriver, and then take off the lock cap. Then, you can knock around the lock head with a hammer, so that the lock core can be removed. If you need to install a new anti-theft door lock, you should prepare the lock core and lock body with appropriate size in advance, and then tighten the fixing screws.