"The Natural Philosopher" wrote in message
...
On 22/05/2021 19:34, Joey wrote:


"Harry Bloomfield"; "Esq." wrote in message
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on 22/05/2021, alan_m supposed :
In my experience, if the screw comes out once it will do it again
unless you put a bit of superglue or nail varnish on it to stop the
screw turning.

Yep, did that - I used superglue.

You have to be careful with that, I ****ed a pair of
sunnys with a fingerprint of superglue on one lens.

Acetone - nail varnish remover - is the easiest to obtain solvent for
superglue

The problem isnt superglue added
to the lens, it has damaged the lens.

I do not know whether it also dissolves polycarbonate lens coatings...it
does not attack polycarbonate itself

But superglue does. The lens edge and the frame werent
well done enough so the prescription lens kept popping
out so I superglued the lens into the frame. That worked
well, but the result was ****ed due to the fingerprint
on the main part of the lens.