50403-ZVD-000 Hook Return Spring - Overview. The 50403-ZVD-000 Hook Return Spring is a genuine Honda marine rigging component vital for the smooth and reliable function of your engine's hook system. This spring supports the mechanical rigging system by ensuring proper tension and retraction necessary for engaging and releasing the hook mechanism, a key part of control and safety in marine engine operation. Designed exclusively for Honda marine engines, it seamlessly fits and works with existing