A cutting tool comprising a metal plate having a central aperture, a forwardly extending blade and a rearwardly extending tang having a second aperture offset from the central aperture, wherein the plate is coated with an electroless nickel layer. The mounting hole is located near an edge corner of a cantilevered mounting tab that forms part of the plastic component. The first signal is transmitted from the second network device using a first modulation system. processor is further arranged to switch the transducer to the transmit mode in response to receipt of a sonar ping signal from the homing torpedo and to cause the transducer to transmit a return pulse that acts as a decoy signal to the homing torpedo. A method and a system for effecting currency transactions between two users over the Internet or other communication network are also described.