Sealed Mason jars, whether they are heat processed or vacuum sealed, can be difficult to open. If you use a bottle opener or church key, you risk denting and damaging the lid. So I wanted to make something with a longer contact point with the lid to make it safer to use.

Sized to work for both standard and wide-mouth lids, for the standard Ball/Kerr style Mason jar lids.

This is a pretty trivial design, so do whatever you want with it. I am including the FreeCAD project in case you want to make any adjustments (the load point could stand to be adjusted a bit, and I may iterate the design).