The tungsten 6mm bead from taska is the ideal tool for a number of rigs although the preferred rig is the helicopter tapered inside to ensure that it fits well over a core zero or other leader the bead is placed about 6 up which allows it to grip well but come off if snagged the bead is placed close to the swivel so the swivel on the rig can rotate around the core zero to stop the hook link from tangling on the cast the helicopter rig is ideal for fishing at long range or on silty lakes