The invention relates to a method and an arrangement for producing body components being provided with an acoustically-effective silencing material layer. A locking mechanism is conveniently placed within reach of the operator and directly controls the motion of the gear assembly. The package assembly includes a blank having first and second panels that can be folded over one another. The first and second motion control modules are interconnected and guide a carriage assembly therebetween in order to perform an operation on the generator.