There's lucky

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.

There is a god.

on 22/05/2021, alan_m supposed :

Yep, did that - I used superglue.

If true then the screw wouldn't have come out in the first place.

yep. I am not in favour of a religion which bashes your head against the wall so its lovely when it stops

...perhaps the joke is countless human misery.

All of those screws have been captive screws with all of my frames and I have had lots over the 65+ years I have been wearing glasses.

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

Joey pretended :

This one might have been, but I have had a few before which were not.

In message snipped-for-privacy@mid.individual.net>, Joey snipped-for-privacy@hotnail.com writes

Mine drop out regularly. I have a set of watchmakers screwdrivers and lots of disused glasses to cannibalise.

Specsavers were very sniffy when I asked if I could have/buy a few spare screws. They start off much longer for ease of handling and you break off the excess once tightened.

It's an intentional design feature, to get someone else to scratch your back.

Often not sufficiently captive though. They seem to be centre punched to secure them; presumably glasses shops have a neat jig for holding them securely, with either a press or a guided punch. I have often thought about asking them how they do it.

Years ago I bought a littel kit that included a (useless) mini screwdriver, some nose pads, and assorted screws. Still have a lot of it.

I can. I can even touch fingers behind my back. But only one way; I'm somewhat asymmetrical.

Then you should get a clue and use a different supplier or use nail varnish etc when you get a new one.

Makes more sense to do the above.

Still better to ensure they don't come unscrewed.

newshound has brought this to us :

The worst struggle, was getting the screw started. I tried starting it with the lens in place and I couldn't get the frame gap closed up enough. I then finally did it by just starting the screw, then squeezing the lens in, before screwing it in all the way.

My plan c, would have been to pull the frame together with the lens in place, by using 5amp fuse wire around the brackets, to enable the screw to start.

And a bit of loctite applied first? Brian

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

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

None of my glasses have ever had captive screws. Fortunately I have a decent stock of obsolete glasses for spares