Sorry Jordan that my post sounded a bit patronizing ! It wasn't intended to be.
I was visualizing a much heavier chain, like to limit the opening of a door. As it is such a light chain the cracking must have been caused by overheating the steel which then was not ductile enough to stretch back as it cooled and so had to crack. Whether it was done in the original production or by you I think is now very hard to tell.
David
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