) writes:
I can reasonably solder electronics although I get an occasional cold
solder joint. I have this pair of glasses I didn't wear much which
cracked near the temple joint. (The temple cracked). The repair shops
ask too much, compared to what I paid for the glasses. I tried online
to find temples, to no luck. So I'm considering soldering it. My
uncle (a retired EE) told me it would never hold. Part of the problem
is it cracked very near the screw joint. and so would suffer a lot
more torque than if it was further back. Any tips?

You drill holes on both sides of the break, and "sew" it with fine wire.
I suppose strong thread would work too. Then epoxy over it, using heat
so it solidifies fast.

Or if you still want to solder, drill the holes, wire it together, and then
solder the wire and frame together. The wire holds it together, the solder
just adds a level of firmness.

Michael