After serious thinking Michael Atkinson wrote :
Several of our pan lids are now decidedly unstable and fall apart at the
slightest opportunity - potentiall dangerous when hot. And very annoying.
The pans themselves are of "lifetime" quality, metal with copper bottoms -
I don't want to replace them.

The majority of these problematic pan lids have wooden knobs, attached via
a metal bolt. The thread on the inside of the pan lid has essentially worn
down over the years, and now doesn't allow the bolt an adequate "foothold".

Could you perhaps buy some machine screws and nuts made from stainless
steel to replace them?

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk