This is why I use two of the thin rubber squares or circles. I can even sit the jar on top of one sometimes, and it has enough resistance to hold the jar while I open the top with the other. Though, usually I wrap one around the jar or bottle and hold that with one hand, then use a second one on the lid. It nearly always works. I've had very few that wouldn't, then I try hot water on the lid, a handy husband or handyman (always pointing out that I loosened the top), or even use a "church key" to pop the edge of the lid. I had to do that once when even my handyman couldn't get a jar opened. I used the key while he was going to his truck for a wrench. ;-)