MIWA disc tumbler cylinder thumb-latch decorative lock disassembly cleaning repair due to operation defect

"The key doesn't work well"

The apartment was quite old. MIWA's thumb-latch decorative lock and U9 auxiliary lock were installed.

When you open the door and try to check it, it's a room where you don't have a place to step because of all kinds of garbage. A client came out from behind it. It seems that there are times when the door does not open well from the outside when I hear it.

The operation of the latch bolt seems to be fine, but the movement on the thumb-latch side is not good, so I decided to disassemble and clean it.

After cleaning, I tried to put it back on and attached it to the door. I had no choice but to adjust and fix it with Loctite, but I adjusted it well and improved it.