After many tests on bottles with different types of caps (cork, chipboard ...), I put the pan where it has its place: in the trash. Indeed, the spiral has insufficient diameter and the corkscrew does not pull the plug, but pulls destroying the central part of the cap .. result with a real corkscrew, it is then very difficult to remove the cap cleanly without dropping crumbs cap in wine (and the stopper is definitely not in use)!
