GOAL D9.QDD-866＋TDD, Unlocking the entrance door by not carrying the key

"I forgot my keys when I returned home."

There will be more cases like this after the holidays. The main lock is completed with normal thumbturn unlocking. The lower auxiliary lock is a long way away, but I didn't think it would be a problem.

I searched for thumbturn, but couldn't find it. Handles and door posts often get in the way, but this time I felt something strange.

Replace with a tool with a camera. When I checked it, it was a chevron-shaped thumbturn. It's probably because of this shape that it slips. If it is a main lock, there is no particular problem, but if it is a auxiliary lock that is far away, even a chevron-shaped thumbturn will be repelled. Tools with cameras have too little rigidity and bend. The tool was replaced with a more rigid one and the work was completed.