Tell us about yourself!
Yup, Mother Earth News had a set of plans, a friend and I got. Think it was around 1975 they first came out with it. We never did finish the project.
Raspberry Pi Class
I have been using your method for years but with a vintage 60s beer can opener to pry with. I never have broken a jar top. Sometimes rusted fruit jar bands are so hard to loosen the bands are unuseable after getting them off.