shaft 208 and then out through weep holes 226 into the gap 228 between the housing 202 and the shroud 240 this leakage fluid then flows through passages 232 to atmosphere via the open end of the shroud 240 another portion of the fluid in leakage path 230 is diverted forward and outward through the passages 220 in the shaft 208 to the space 222 from the space 222 most of this portion of leakage fluid then flows through the helical groove 224 to the balancing chamber 221 a small portion of leakage fluid flows toward the head 216 through the annular clearance space between the reduced diameter portion 214 of the shaft 208 and the housing 202 during operation the shaft 208 becomes axially dynamically balanced on the stem 210 such that mechanical bearings are not required the lubricity of the fluid flowing through these leakage paths 230 and through the balancing chamber 221 sufficiently supports and lubricates the shaft 208 and attached spray head 216 such that bearings are not required furthermore the fluid flow through the helical groove 224 provides the rotational torque necessary to rotate the shaft 208 and its attached spray head 216 this torque generating function is performed entirely by the leakage fluid flow therefore offset nozzle tips are not necessary to rotate the nozzle head 216 as in previous designs however where high rotational speed is desired offset nozzle tips may also be advantageously employed in these embodiments since the head 116 and 216 are interchangeable with other head designs balancing in this embodiment 200 occurs because as the fluid pressure in the space 222 exerted by the leakage fluid increases an axial force pushes the.