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What’s wrong with it ? someone might answer if the image showed the type of damage

If its broken in two pieces then you might be able to make threads on both ends and then tighten with a nut.

What happened? I’m currently wearing a similar lindberg frame. Love them!

Wife is a 30 year optician, go locate an independent optical shop, who offers soldering. The chains (my wife working for one of the largest) will not. They use a jewlery grade silver solder. If no independents in your area, a jewler may be your only choice.

That is an excellent idea! I just had to replace both arms on my mother's glasses. Only one was broken but of course they said you have to replace both at the same time so the one that isn't broken won't soon break. I'll do what you suggested next time and save money! Damn I feel dumb...

You can't silver solder titanium. It needs to be welded in an oxygen free environment, with something like this. https://sunstonewelders.com/products/micro-tig-welders/orion-s-series-micro-tig-welders

Or a laser welder. Almost any jeweler will have one.

Where the green line is, that part is broken into two

I have a Seiko titanium frame from years that broke, they are no longer made. After about 3 months a broken one popped up on eBay. I used its part to repair mine. Still using it!