Maintaining tension on your wire diver is essential. The 304 Stainless Compression Spring is designed just for this purpose. Simply Reel up apply tension to the spring and stop, preventing the wire from Back Lashing around the spool. The Neon 16mm bead will keep the spring from tangling in the Twilli Tip or the top eyelet. The Nylon Gasket on the bottom prevents the swivel from tangling in the spring.