Upon evaluation of the light arm rear knuckle assembly, it was observed that a portion of the knuckle had broken off the main knuckle assembly.The fracture of the knuckle started where the rotational stop pin is located.The rotational stop pin is designed to prevent the operator from rotating the light more than 360 degrees during use.It was also observed that the rotational stop pin was missing.The round counter bore hole where the stop pin is located was deformed in an oblong shape.This is indicative of force being applied to the rotational stop pin as the direction of the deformation was towards the section of the knuckle casting that had broken off.As a result, the rotational stop pin was exposed to an excessive force during use causing the failure of the knuckle assembly.
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