Inventor Andy Klein, whose twin-turbo vise we looked at here, has come up with something insane: A large screw that appears to have no slot at all. So how do you drive the thing? He shows you around the 30-second mark:
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If you watched the whole video, you've seen his entertaining "treasure hunt" idea to gauge interest. And if you want to hear an update on the project, just yesterday Klein released a livestream on it here.