AGENT GMD-500+SHOWA ISD knob Unlocking the entrance door

"I forgot my key at home."

It was an old apartment built 47 years ago. knob door. When I checked the knob, it was a universal replacement GMD500 made by AGENT, featuring a rose part.

I usually proceeded with search unlocking, but I couldn't quite discern the edge of the target point of thumbturn. I used a straight type tip jig, but in the end I changed to a tool with a camera and tried again. The thumbturn position when locked may be mounted vertically, so you need a camera if it doesn't go smoothly.

The one shot didn't go well, so it was the third shot. I was so embarrassed.

I had completely forgotten that this type of thumbturn in Agent is small. It is a reflection.