is as pictured but turns out to be unnecessary
Vademecum toothpaste supplied a key like this for winding its metal tubes of toothpaste in the 1960's, and the key stayed in place where wound down to on the tube.  I think the reason it stayed was that the tube was metal.  My toothpaste tubes are plastic; at least, I can tell they are not metal.  This key does wind down but there is another way to get the most out of plastic tubes without a key like this one.  Here it is:  while holding both ends of the closed tube, place the end opposite the cap against the end of a counter or sink vanity and pull it downwards so that any paste remaining toward the end of the tube is forced toward the opening.
Rating: 4 stars