"Mike Barnes" wrote in message
...
In uk.d-i-y, D.M. Procida wrote:
M wrote:

I imagine that filling it up with boiling water, running a seam of
superglue along the rim and thread then screwing the lid on tightly
would get the best results.

i would prefer araldite, can I ask why?

I want to use it to demonstrate a point about physiology and to show how
- when making strenuous efforts against resistant physical objects - we
typically contort our bodies in inefficient ways.

You sound like the right sort of person to confirm or deny a pet theory
of mine that's usually greeted with some scepticism. I believe that, all
other things being equal, a left hander will find it easier to unscrew a
difficult lid than a right hander. The body's geometry makes the right
hand stronger turning clockwise[1],

Thinking about it and being right handed I must admit when faces with such a
jar
I always tend to try using my left hand as it just seems easier that way.
An old plastic container of PVA glue was the last time (not a jar)
and I grabbed a pair of pliers in the end to get it undone.


[1] which is why the "right hand thread" became the norm, people
attaching more importance to tightening than loosening

--
Mike Barnes