MIWA JN.13LA Disassembly cleaning repair because the key does not stick

"Suddenly the key stopped sticking"

It's an apartment in the center of Minato-ku, Tokyo, but it looks like an apartment that has been built for many years.

The common passageway was not open to the outside, and was designed to withstand rain and wind, but when I disassembled it, there was a lot of dust and dirt.

The core was disassembled and thoroughly cleaned for improvement.