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1. During use, add some graphite powder (pencil powder) into the key hole regularly (once every six months or a year) or when the key is not inserted smoothly. Do not add any liquid oil as a lubricant. Lubricant to prevent the grease from sticking to the pin spring, causing the lock head to fail to rotate and not open. If it is difficult to close the door leaf, it can be solved by smearing a little pencil powder on the oblique tongue.
2. When closing the door, it is best to hold the handle, screw the bolt into the lock body, and then let go after closing the door. Do not hit the door hard, otherwise the service life of the lock will be reduced.
3. When the main deadbolt or safety deadbolt protrudes out of the door, do not hit it violently to avoid damage to the deadbolt and the door frame.
4. Because the sealing strip installed between the door body and the door frame has elastic force, when the handle or key is used to unlock the lock tightly, you can push or pull the door by hand while opening the door to overcome the elastic force, and do not turn the handle or key forcefully. Open the door before the handle or key breaks.