Malfunction of Sha-Maison cylinder Special unlocking and disassembly cleaning

"I have a key, but the cylinder doesn't turn."

As far as I heard the declaration, I thought that it would be improved by cleaning the cylinder normally, but when I looked at the target door (Oops! Sha-Maison! The door scope is directly above)

However, the cylinder does not rotate even if I proceed with the work. (What the hell is that)

I showed him a picture, saying, "This seems to be the only way to operate the thumbturn inside." "Is the shape of the thumbturn like this?"

It is a setup to illuminate the tip and make it easy to check.Since the door scope is directly above and the distance is short, I change the tool several times.I finally unlocked it, but even after disassembling and cleaning the cylinder, it still didn't turn.

No further disassembly of the core is possible here, so suggest it to be replaced and you're done.

Locksmiths cannot arrange OEM cylinders for WEST Sha-Maison, so this is the end.

But what was the cause of the cylinder sticking so far?I'm curious.