GeneSF, is that Japanese outlet a backstab type, or do you insert the wire and tighten a screw?
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The Japanese make both. This is a strange one where the wallplate snaps on and the wires are just pushed in.

They also make ones where the wires are screw-clamped in, and the wallplate is attached by screws.

I got both at Tokyu Hands, seven floors of DIY paradise [Linked Image]