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Ahhhhh.
F.Y.I: That’s an oil filter wrench. And my 4 year old took all the photos that show two hands. I rewarded his hard work with pickles.
Gettin' By 
I use a butter knife, just slip it under where the lid ‘lip’ sits between the lid and the jar and ‘jimmy’ it a little and this will break the seal. You may need to repeat this process for a couple, but it works a treat!