I seem to recall reading that you can undo stubborn knots with a corkscrew...

I have used corkscrew on knots a lot, works great.

A knot! Good call. I usually use a marlin spike on knots, or pliers, but I bet a corkscrew would be handy. Also - I hear they can be okay for opening wine

Corkscrews work real well,when your hands lack Dexterity,or lack callouses.Aside from Marlin spike duties,they work real well at Cinching a knot.Carrying a heavy twine wrapped bundle or Package,or whatever for that matter,using the leverage principle,will save your 2 Best friends alot of Grief!

Don't forget:

Mini Screwdriver

I undo stubborn knots with my rope wrench, the Gordian way.

Interesting device. I'd like to try one out myself.