Nut backed off ball caused accident
I was heading up to santa cruz ca. in my 40' american eagle I had my motorcycle in tow on a utility trailer. Before I left I had tighten the nut on the ball with an air impact driver the kind that you...
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Not sure if U-Haul still sells them or not but they used to have balls that came with a plastic washer that would squeeze out once the correct amount of Torque was reached. I always thought this was a neat way of making sure the ball was torqued correctly, it also had the cotter pin through the shaft as a safety.
