The security door and door frame are not very good, and you have to close hard to close! Either go u

If you are sure that the lock cylinder is not damaged, it is not difficult to repair it yourself, check whether the deadbolt and the door frame are displaced due to gravity impact and loose, whether the gap between the deadbolt is too large after popping out, after closing the door, you can generally judge intuitively, if necessary, replace or repair the lock head and adjust the door frame lock cylinder groove fixing parts to solve the problem!

The upper screws are tightened, and the lower screws are a little looser, and it should be done. Ps: The top ones are very tight, and they play a role in lifting them up. Just loosen up the bottom and don't pull the door down.

You can't do it yourself. You have to use a power tool to polish the keyhole.

Whoever buys it, call it to repair it.

Usually pay more attention to the anti-rust lubrication of hinges and hinges. Otherwise, there will be rust and abnormal noise. The hinge lacks anti-rust lubrication, the switch is laborious, affects the appearance, will make a squeaky sound, and affect the rest.

Macalon and other well-known hinge brands use tiger head hotolube or Kruber hinge grease, colorless and transparent, good adhesion and good durability. There is a 130-gram tube package in the leopard, which is also suitable for sliding door slides, etc. Apply grease directly to the hinge and it will slowly penetrate into the hinge.

The maintenance interval is four to six months.

It is not advisable to use lubricating oil or ordinary butter, which is easy to lose or freeze at low temperature, and will volatilize harmful odors. Vegetable oil quickly rancid, develops odors and loses its lubricating effect.