Update: I definitely found the problem. Upon closer inspection, There appears to have been a stress crack at the base of the square shaft and that weakened it and allowed it to shear/twist at the base of the square end. Only the end is affected, and I can definitely see a small twist at the very base. I can probably repair this but does anybody happen to have a left tumbler laying around they would be willing to part with? That sure would be easier.
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