D.M. Procida wrote:

I want to make an unopenable jam jar - one that will resist the
strongest grips.

What's the best way to achieve this?

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.

Daniele

I'm sure a suitable application of 'ki' would open it anyway

Alan
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