2. After the screws are tightened, unscrew the lock core of the door lock and put it on the screws on both sides, but don't tighten these two screws too tightly when installing, so as not to open the handle of the security door too tightly. Remove the handle first, and then remove the lock cap.
3. Put the lock cylinder into the sleeve and take it out, and put it together with the screw. Remember the steps when you dismantle it, and the same when you return it. Everything that has been removed should be put away in a unified way, and don't lose it.
4. Unscrew the screw fixing the lock cylinder of the door and remove the old lock cylinder. If the screw is removed, the lock cannot be pulled out by hand.
5. Install the handle after installing the anti-theft box of the lock core according to step 3. Before installing the handle, now insert the safety bolt and install the handle on it.
6. Install the inner and outer handles of the lock core of the door lock, and someone will help to press them together so that they can meet symmetrically.
7, adjust the internal and external handles, must be coordinated, screw holes should be aimed at the nut there, or use a flashlight to illuminate before screwing.
8. Insert the door lock core wire vertically. When inserting the screw, shake the screw with your fingers if the nuts inside are not aligned.
9. Fix the panel and tighten the screws. Pay attention to the fact that the screw of the lock core of the door should not be too tight and the handle should not rotate flexibly.
10. Finally, try the lock cylinder effect of the door lock. Be sure to try it again with the door open, and twist the safety by inserting the key and rotating it 360 degrees.