Sentence: Notwithstanding the use of special assembly techniques, it is currently quite common to find, downstream of the assembly line, known radiator caps with the small spring of the low-pressure valve imperfectly aligned with one of its necessary bearing surfaces and/or with the shutter, which leads to unpredictable operation of the radiator cap and consequent rejection of the product.
Entities: entity1: spring; entity2: valve
Relationship: Component-Whole