So I don't know about anyone else, but when I'm downstairs working on rebuilding an axle. And you get the "I can't open this jar can you get it" call, and you just started greasing everything up. We'll hollering back give me a minute usually means 20.
So how to make opening that jar easy enough for everyone?
Well my solution looks like this.
Yep. A tire. If you modify it a bit, it's now a jar opening machine. Just cut the sidewall out of one side.
Now slip it over the jar lid. No more hands slipping around.
So get a grip. Put those old tires to use!!

Great use for old worn out tires I bet!

Nice thinking.