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This kind of lock recommends that you do not change the lock cylinder yourself, the process is more cumbersome, and the hardware market generally has.
What brand of anti-theft door in your house go to the building materials city to find what brand of store, and then ask the boss for the corresponding model of lock cylinder.
Regular lock picking companies and hardware lock shops, such as (Li Wen lock city, actually home) and so on.
1. Unscrew down the two screws on and below the pull handle panel; >>>More
It's quite simple to change the lock cylinder of the anti-theft door, just a diagram.
It is recommended that you buy it on Taobao, which is much cheaper than in a physical store. Just pay attention to the specifications of your existing lock when buying, otherwise you can't use it. I've bought good ones online.