
I was expecting the plastic nut on the bottom, but you can also unscrew the top plate and install the plug from underneath.

Just be careful when you screw the face plate back on, as mine became cross threaded, and the more I tried to remove the plate again, the tighter it became. There's no way to remove it now!Still works good, I removed one star for the stupid design that even allows a cross thread to happen.

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