TOSTEM MIWA-U9.QDK668, key operation defect inspection and repair

"Sometimes the key won't turn."

They asked me to check it because sometimes they can't get the key out. Although it is a detached property, it is a proper apartment. There were two units for rent on the first floor and one on the second floor. This is a rare property. In particular, the inspection target was a detached house on the first floor.

TOSTEM MIWA-QDK668 push-pull handle lock. Moreover, this is also a rare U9 cylinder cylinder set with a shutter. This type of cylinder requires disassembly, so disassemble it according to the instructions and clean the dirt attached to the cylinder core.