AGENT-GMD500.MIWA-HBZSP2, Inspection and repair due to falling knob of universal replacement knob

"The door knob suddenly fell off."

According to what happened over the phone, I was told that the door knob had come off along with the cylinder. That seems like a pretty serious situation. Maybe it's just a door lever instead of a door knob.

When I arrived and checked it out, it was the Agent knob. It wasn't the door knob on the cylinder side. It was a door knob on the inside thumbturn side.

The repair was completed by applying Loctite to the door knob to prevent it from loosening and reassembling it.