Added GOAL P6-MDU auxiliary lock to improve security performance

"It's an old house, so I want to increase the security of the front door key."

It was an old detached property. It looks like the door has been painted. However, it came with Kawaguchi Giken's dynasty Deadbolt and lever. The lock made by Kawaguchi Giken on the entrance door is quite rare.

I tried to replace this Deadbolt with a GOAL V18-AD lock, but the front was too different. Requires additional repair stepped hardware and woodwork.

In that case, the additional installation of P6-MDU would have made the work quicker, and the cost was somewhat lower.