The bottle with the corkscrew on the inside is my favorite. My best guess is that the corkscrew handle, without the screw, was hung inside by threads. The cork-

The bottle with the corkscrew on the inside is my favorite. My best guess is that the corkscrew handle, without the screw, was hung inside by threads. The cork-with-screw was then pressed into place, probably with some glue on the end of the screw. The handle could then be pulled onto the screw with the threads, and the threads pulled out of the bottle.