This article was written by “Marathon John” Cacciutti in the December 1992 issue of Sport Fishing Magazine. Downrigger Probes article reads, “By using the Zwing (manufactures by Nekton Inc.) in place of the downrigger ball, scope can be minimized at all speeds and depth settings. The shape of the Zwing uses hydrodynamics versus weight to keep the downrigger cable close to vertical, below the boat, and away from trolling spread. As the boat speed increases, so does the downward force on the cable."