I had a few gold break one time. And I think it was my fault. The Mold was bad hot and the lead was also warmer then it should have been. (Someone was pouring for me) I got him stopped and there was a lot of the ones that were way to hot in the mold. Well some of those broke. We have been selling Matzuo Hooks for a year, And have sold them from the smallest up to an 11/0 Sickle hook.
The only ones to break was the ones over heated in the mold. Next batch may break on me but have not yet.
Pete