The Brabantia Corkscrew has a very simple but ingenious principle: start Corkscrew, turn, turn, turn, then the cork is out, without that you need some which exertion or leverage. The design I really like, and a foil cutter (small Schnittmesserchen to cut away the "trim" from the bottle head without Gefiesel) is also integrated. So all you need to undo a wine bottle easily.