On 2016-12-11, Jack wrote:

I learned long ago the easiest way to open jars like this is to run hot
water over the lid for a few seconds. Seems to work 100% of the time.

I learned a long time ago yer method does not always work.

Take the backside of a butter knife and apply glancing blows to the
outside-upper corner of the cap --in the direction of "lefty Lucy"--
to loosen the cap. I've use the same method --with a hammer and a
cold chisel-- to loosen rusted bolts/washers.

Gar-own-tee!

nb