U9.HMD knob exchange A certain country's large cultural circle club room door

"Broken key cylinder replacement"

The university grounds were large and time-consuming.It was the door of the club room of the Cultural Circle Building.
The door requested was not a sliding door, but a hinged door.

It was said that the key was broken, but the key was lost and I couldn't make a spare key, so I was asked to replace it.

I should be able to go without any problem by replacing only the head of the HMD, but since the front screw is spinning and barely stopped, I stopped it with M5 sun lock and tapping.

The conversation behind the students was funny!