boogaloo:Metal becomes work hardened from hammering, etc. and can become brittle and crack. To prevent this you can heat (anneal) the metal with your torch which will soften it again.
I bought some headpins last summer at a great price from a vendor at a bead show. Now I know why they were priced so cheaply - when I use them and make wrapped loops, they break, hence they are brittle. I thought to myself, what a waste of money!
Do you suppose I could heat them with a torch to make them pliable again, without deforming them? I was going to throw them in my scrap heap but hadn't gotten around to doing that yet. A headpin is of no use if they break when you bend them!
If no one answers here, I'll repost this in a thread by itself.