I have long been the Tupperware can opener and got very used to the slightly different handling. If I use a "normal", I find the comparatively stiff and there is often times to injuries caused by sharp edges doses. Very soft cans are even partially deformed and can hardly be open properly. This happens all the Lurch -Dosenöffner not, which is really a recommendable, inexpensive alternative to the expensive part Tupper and works the same. I have several times worried him for my three daughters, who all established their own households while ago. He really works properly if you have adjusted to the slightly different handling. There is no instruction manual, but on the packaging image you can see the handling roughly. This should be observed: - The opener is not laterally, but on the can set - The opener is first opened and jammed the upstanding edge of the box between the small sprocket and the protruding wheel, the wheel must run on the box along the side while rotating. - The opening of the can is hardly noticeable, the cover remains as before in the can, he does not raise! - The lid is lifted now using the side-mounted "beak". It works similar to pliers and is recognized at the edge of the box. All in all, the Lurch openers really recommended and also a nice gift idea!