A magnetic head structure has a coil and a magnetic pole allowing a magnetic flux generated by the coil to be transmitted therethrough and forming a magnetic gap. The revision guide includes a rod adapted for intimate contact within an intramedullary canal of a femur, and includes a threaded passageway. The control opening is designed to at least largely prevent fluid flowing out of the conveying line and into the fluid tank when at least one minimum level in the fluid tank is exceeded, and wherein the control opening is further designed to allow fluid to flow out of the conveying line nd into the fluid tank when the at least one minimum level in the fluid tank is undershot. The tiperon has an approximately L-shaped configuration, and can be rotated relative to a fixed portion of the flight structure about a control axis. The composite-dot forming pulse train and non-composite-dot forming pulse train have respective waveforms configured such that an ejection velocity of the single ink droplet forming the non-composite dot is lower than an ejection velocity of said plurality of ink droplets cooperating to form the composite dot.