GOAL thumb-latch lock S5.GF+GV.AD, XNUMXnd day after moving in, check malfunction of front door lock

"Sometimes the door won't open"

It seems that they just moved in yesterday. It is a door with two keys, but it is difficult to understand because the unlocking and locking directions are opposite directions. Moreover, it is said that the thumb-latch lock malfunctions and the door does not open.

I determined that it needed to be disassembled and cleaned. It is also possible that the lock body case is defective. It is also possible that the thumb-latch mechanism is defective.

I disassembled it and checked it, but no damage to the parts was confirmed. Done with regular cleaning. Even so, the thumb-latch lock is difficult to operate because it requires the strength of the thumb. After all, it ended with malfunction repair due to aged deterioration.

When replacing the main lock,GOAL thumb-latch lock (antique lock) "GB-52-3"will be. However, it is only for S5 pin cylinder.