I have several of Magnivision Titanium reading glasses. They are by far the best I've tried, and I've tried just about every brand there is.
There is just one little problem. The nose piece and the side pieces are attached to the lenses with tiny bolts with a tiny nut on the inside. Over time (few months), these work loose. If I catch them soon enough, I can tighten them and they will stay put for another few months. If I am too slow, the glasses fall apart.
The ones for the nose piece are much more likely to loosen, probably because they get wiggled more.
I have tried superglue, but it really doesn't hold.
Can anyone recommend a way to secure these nuts? If it is permament, so much the better. I don't know why they don't use rivets. I will never want to loosen these nuts.