Day 2 with more breakdown drama, but no towing required by the sounds of it.
https://m.facebook.com/GreatTexas30...08551/?type=3&source=48&__tn__=EI'm not a metallurgist, but that rust spot inside the break makes me think there was at least a hairline fracture there, ultimately leading to the failure of the component (albeit with disastrous timing for your quest for regatta glory).
Great job on the at-sea MacGyver-ing!
Mike