TwistLOCK Centering-Pin Spring (CPS-patent pending) which is a unique setup for rigging soft swimbaits, flukes, and other swimming plastics. The added weight helps sink or "swim" the rigged bait down into the strike zone, while the blade adds a fish-attracting flash. The spinner blade is attached to a non-moveable weight that keels a rigged soft plastic perfectly for use as an ideal "search" bait.