A developer includes a waste toner container having a cleaning member to clean a photoconductive drum, and a waste toner transporting member to transport waste toner from the photoconductive drum to a waste toner storage area. A second elongate sheet is provided and has a shape substantially conforming to a surface on the other of the suction side or the pressure side of the airfoil. The locking member is mounted solid with one of these ends being able to occupy an unlocked position in which it is disengaged from the connecting mechanism for tightening and loosening the collar and a locked position in which it engages with them to oppose this loosening. The delay element and timing signals are adapted to cope with FFT processing of the multiplexed streams using the single FFT device only. The DWCS preferably comprises a motion program generatorkernel, a user interface, one or more replaceable orientation and process models, and a communications interface to a fluid jet apparatus controller. The retainer has two transverse through holes arranged in parallel, and two peripheral gaps through which the respective wire rods of the first and second wire meshedgrilled members are respectively set into the transverse through holes.