Bulges indicate "forming" at factory. If I am understanding that there are bulges opposite the "wear indent", that would prove it's a factory operation to indent by forming. Either to create a recess for a part or to create a stick out on the inside as clearance for a part or so something can rotate without rubbing frame.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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