it's the joint. But if you're in any doubt, maybe flex them gently (with your hands) before building them up and trueing them. If they're gonna snap, make sure it's before you've ridden them so you can get a replacement more easily.
@freddo started
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it's the joint. But if you're in any doubt, maybe flex them gently (with your hands) before building them up and trueing them. If they're gonna snap, make sure it's before you've ridden them so you can get a replacement more easily.