The invention relates to a liquid-cooled plasma burner, comprising a nozzle bore for the plasma gas jet to exit at a nozzle tip and a first section whose outer surface gradually tapers in the shape of a cone at an angle \u03b1 in the direction of the nozzle tip, except for at least one deflection section that extends in the shape of a cone at an angle \u03b2 in the direction of the nozzle tip. The wheel is rotated by an electric motor about an axis, and the motor current fed to the electric motor is controlled dependent on the rotational speed and torque required for the mounting andor demounting operation. The modulation cycle includes a light emission period during which the light emission pulse is present, and a non light emission period other than the light emission period. In another aspect of the invention, the second tie rod engaging portion is configured to receive tie rods having threaded bars that extend through tubes and between parallel wall form sections. A warp yarn alignment station includes two sets of rollers spaced apart to allow the warp yarns to pass between the two sets of rollers, wherein the of rollers are over-driven to provide a roller surface speed greater than a predetermined speed of the warp yarns.