U9.DZ (BH) Unlocking the front door due to improper cylinder installation

"I got a new key when I moved in, but sometimes it doesn't open."

I wanted an inspection.Even though there shouldn't be any operational defects, such as improper unlocking when moving in, requests for inspections come in quite frequently.

The cause is improper installation of the replacement worker.I don't know if it's a person from a management company or a locksmith, but there are various things such as halfway installation or accidental installation.

It was a bad installation this time as well.Moreover, it was installed by force.The front is floating by tightening one screw.Moreover, the cylinder is upside down.No wonder, probably because I didn't know the correct mounting method.It is also true that some companies lack various skills.

The lock body was also installed at an angle, so the cylinder was installed at an angle.I disassembled it once and set it correctly.The lever was also hanging down, so it was improved by washing with oil.