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If you can, it is recommended to change it yourself, because you ask someone else to change it, I don't know the situation of that person, in case you encounter a secret key to keep, then you will be in trouble.
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.
How much does it cost to change the lock cylinder for the security door. >>>More
There are thousands of lock cylinders for anti-theft doors, the price is not the same, if you do not require quality, do not consider safety, you can install plastic cores, lead cores, of course, the price is low, dozens of yuan can be installed. The relative quality of copper cores is guaranteed, and the price ranges from tens of yuan to hundreds of yuan, and thousands of yuan may be available.
You go to the lockpicking company and call 114 to check and they can help you change. >>>More