SHOWA DAC2.IS, cylinder cleaning repair due to operational defect

"I can't insert the key"

I was told that the key would not stick. As a result, he was unable to lock the door.

SHOWA knob lock DAC2. The cylinder was spray cleaned and improved. In addition, since the center position was not exposed, the knob was difficult to return, so I disassembled it, reassembled it, and adjusted it.