Is there a simple household technique to undo the seam of olive oil cans?
Olive oil is sold in 3L metal cans. They might have a shoebox profile - are brand names OK? Filipo Berio brand. There are smaller volumes as well. These metal olive oil cans are seamed in some specific way, similar to other cans. If the can could be "opened" the way modern-era "can openers" do - leaving no sharp edges, the can might be put to new uses around the kitchen or beyond.
I have tried an Oxo modern-era "can opener" that leaves no sharp edges - but this makes a mess of the can. I have a 6-inch hand seamer that will not work. I have tried a cold chisel and this has some promise but also makes a mess of the can.
I have looked for unusual tools and found out about can seamers, jump shears, or other things. There was an artist on public television showing how she undid certain metal cans with a pedal-driven shear. One day perhaps I might get such a tool but for now I am looking for easier/simpler methods. I might ask about this on Arts and Crafts Stack Exchange, but figured to start where the olive oil can came from - the kitchen. Perhaps if I know what to look for, it will help - for instance, the type of seam.
... but even if I "open" the can in an ordinary fashion, it would be interesting to know the precise process that introduces the seams.