This spring wire is a tension element used in the header of a self-propelled forage harvester. It applies a controlled force to a moving component, such as a feed roll or a knife drum, to maintain consistent pressure against a counter-surface during operation. A fatigued or broken spring wire reduces the contact force, which can lead to uneven crop flow or reduced chopping quality. The wire is formed to match the original geometry of the assembly so that the preload and working stroke are preserved without requiring adjustment.