MIWA U9.PMK knob rim lock, cylinder operation defect inspection and repair

"Sometimes the front door lock won't turn and I'm not feeling well."

Apparently there have been several times in the past few days when the key wouldn't turn. Due to concerns, I requested an inspection and repair. When I arrived at the scene and checked, I found that there were times when it would not turn. It seemed like it could be improved by cleaning the cylinder. This time, without disassembling it, we carried out normal spray cleaning work and it was improved.