Docking the shuttle and locking it securely is the function of the Receiver. The locking blade engages the groove on the shuttle for large pulling forces. Once the tool and rope is retrieved, the Shuttle is removed by pushing down on the release tab.
Mount it to either arm of the Boomerope, with the buckle-like snaps, to select the direction of target approach and rope threading, from right to left or left to right.
Always recommended to have a spare.