Magic Joinery

Imagine - joinery using magnets to turn screws already inside your work piece! Well, here it is...

Lamello's Invis system of knockdown fasteners consists of male and female parts that are sunk into your workpieces-to-be-joined. Once the pieces are lined up, a magnet inside of a plastic box is then attached to your drill. You spin the drill near the fasteners, and the screw in the male part starts turning. Here's a demo of a guy using it to attach stair treads: 

https://www.youtube.com/watch?v=1MVjViz5w6Q

https://www.youtube.com/watch?v=cNcIbwxZ_ic

While they recommend using a CNC machine for this, it can also be done (a bit more laboriously) using their pin-and-jig rig:

https://www.youtube.com/watch?v=R9nJ8ePzd8s

Cheers, Gaston