My Mom uses and electric jar opener. She sets the jar inside of this contraption. This ring comes down over the jar, tightens, then twists the lid open. Works really well:
I've tried most things out, as I have arthritis that affects my hands. I still like a gizmo that looks like a wrench and fits over the top of a jar. There are little holes in it to calibrate it for the size of cap. However, it doesn't fit everything. I got that years ago at a hardware store.
You may want to search online for "Arthritis friendly" or something, and also try the Arthritis site at http://www.arthritis.org/. Carol
Best~
Hap
http://www.amazon.com/s/?ie=UTF8&keywords=electric+jar+opener&tag=yahhyd-20&index=garden&hvadid=43148598011&ref=pd_sl_35r7nhsgum_b
You may want to search online for "Arthritis friendly" or something, and also try the Arthritis site at http://www.arthritis.org/.
Carol