The instrument leader may use a metal line that can have multiple tethers attached to it. The leader connects the instrument to the rocket.
If an instrument is dislodged during a rocket trip, it will have a lock leading to the rocket through the instrument swivel leader. Located at the rockets apex, it can have multiple connected tethers and
secured instruments so they will not be ejected and lost. The
instruments may be located and secured at almost any location on the
rocket. Instrument leaders and tethers may be used for payloads, flight
sensors, space capsules, instrument
packages, altimeters, flight computers, and corded parachutes. The
instrument uses a swivel to prevent cord entanglement. Photos show small
versions and a leader knot for tying two lines together.