This tension spring provides the return force for a moving component in the seed-metering or seed-delivery system of a grain seeder. It connects between a fixed anchor point and a pivoting lever or linkage, pulling the assembly back to its rest position after each actuation cycle. A spring that has lost its preload or has taken a set will allow the linkage to drift, causing inconsistent seed drop timing or incomplete closure of a seed gate. This original manufacturer spring is formed to the same free length, wire diameter, and coil count as the original assembly, so the installed tension matches the original design without requiring shims or adjustments.