Single Halyard Lok-Up by Rupp Marine®. Rupp Lok-Up's are an innovative new patented pulley system that locks down your halyard lines, keeping your outrigger release clips right where you want them. Robust modular design is adaptable to various rigging setups, and includes a spring loaded trigger for positive locking and unlocking. Rupp Lok-Up's accept a wide array of halyard line material and thicknesses. Replaceable, serviceable locking components.