76 extends through an annular opening 77 in the chuck body 26 an annular seal 78 which may be formed from cotton felt circumscribes the distal end of the nozzle 76 and functions to prevent any back flow of coolant from entering the interior of the housing 3 the proximal end of the nozzle assembly 7 includes a stationary spindle 79 that is rotatably mounted in a bore 80 present in the proximal end of the driven shaft 5 two sets of roller bearings 87a b are disposed between the stationary spindle 79 and the bore 80 to minimize friction when the driven shaft 5 is rotated relative to the nozzle assembly 70 additionally the upper end of the stationary spindle 79 includes an annular recess 89 for receiving a set of thrust bearings 91 for reducing friction generated by thrust forces in this area at the distal end of the nozzle assembly a single set of roller bearings 93 are disposed between the outer diameter of the stationary nozzle 76 of the assembly 70 and the inner diameter of the tubular chuck body 26 a set of thrust bearings 95 is disposed between an annular shoulder 97 circumscribing the nozzle 76 and an annular flange 99 extending around the inner diameter of the chuck body 26 the spindle 79 and proximal end of the nozzle assembly 70 not only strengthen the rotatable connection between the driven shaft 5 and tool coupling 17 to the stationary housing 3 but also transmit reactive thrust forces generated by a cutting tool.