one of my ideas was epoxy. go get some from freddies or any hardware store, mix up a bit on a paper plate and smear it on with a toothpick. might want to rough up the edges you'll be gluing, but epoxy holds almost anything together, so don't get it on your fingers. depending on the metal, it might not hold perfectly, but it'll be better than anything i can think of.
it should be fine for your application though.