Over the years, an infinite number of corkscrew designs have been created. The one we will be talking about is  still in full force. It is very practical for extracting corks from very old bottles which, being very deteriorated, tend to break if we try to pull them out with a lever corkscrew.

The design consists of two very thin parallel sheets separated by a distance equivalent to the width of a cork.  One of the sheets is a few millimetres longer than the other.

The system to remove the cork requires a certain amount of skill and starts by inserting the longer blade between the neck of the bottle and the cork. Once a couple of millimetres have been inserted, we insert the missing blade on the other side. Now, with slight oscillating movements of the wrist, gradually insert both blades.  Once they are all the way in, it is time to make a pulling and twisting movement in which the cork gradually comes out.

As the cork is pressed on the outside and on both sides, it does not split.

The foil corkscrew ensures that the cork comes out intact.  For this reason there is a parallel story of the "rogue butler" for whom it gets its other name.

Some butlers used this corkscrew to open the bottles and drink all or part of the content.  They would then refill it with an inferior wine and reinsert the same cork. Eventually, when the owner asked for that wine, he would inspect the cork and see that it was not punctured. Once opened he  would be disappointed.... He could attribute it to many causes, but he would never suspect that this great wine was drunk some time ago.