Years ago on my Dad's '46 pickup one of the fan blades got broken off somehow. In order to keep the fan in balance they broke the opposite blade off as well. It ran that way for a long time.
Not saying that's what happened to yours, but it is a possibility.
The indignation of politicians is NOT a good measure of the gravity of any situation!--Paul Harvey I would rather live my life as if there is a God and die to find out there isn't, than live my life as if there isn't and die to find out there is.