1. When installing the lock body, if there is a heaven and earth lock, the heaven and earth lock must be hung on the heaven and earth hook of the lock body, otherwise later use may cause the heaven and earth hook in the hole of the heaven and earth and cannot open the anti-theft door.
2. When installing the handle, make sure that the safety strip is long enough to be inserted into the safety hole of the lock body. If it is short or only inserted a little, later use may cause the safety tongue to fail to flex normally.
3. The length of the square bar must not be too short. If it is short, the square bar will run into the handle hole. The handle cannot open the anti-theft door without insurance indoors.
4. The two screws of the lock cylinder cover should not be eaten too tightly, otherwise it will cause resistance when the key opens the door.
5. Before installation, check whether the panel is straight. If not, it will also cause resistance to the key rotation.