Something I have done for drawings and diagrams, published in the journal under the heading “Club home of the masters”. In one of the rooms was a note on the machine to edit used caps from glass canning jars. I use a similar device for ten years, and it has never failed me once.
In my fixture and differences that provide additional opportunities. First of all, the versatility: with a roomy ring the holder can edit the different size of the cover. Imposed on the rotary lever ypravlaushiy wheel is pressed by the inside of the holder, providing its rotation, run-in and alignment bent or deformed can opener surface.