OSHIMA NIKABAthumbturn malfunctioned and disassembled and cleaned

"My thumbturn got stiffer this morning."

A community center.When the museum opens, it seems that the thumbturn of the service door is hardened and does not turn.

Oshima NIKABA's hairpin type.It was improved by Omaginai spray cleaning, but since it's a big deal, I'll try disassembling everything.
After all, it is difficult to handle.Since there is a lot of plastic, there was a risk of cracking due to the tightening torque.There was a case where Maruza plastic cracked in another repair case.

It seems that it was replaced by a designated contractor, but it seems that the stock of Ohshima, which seems to be a new model number but is in low demand, was forcibly installed with escutcheon.
BS38-40, but the front is not long.The inner lever is loose because the lever does not go all the way in because it is 3 mm over the escutcheon for the door thickness.It cannot be adjusted.What a sloppy locksmith.