410 at the gimbals 39 bearing 408 and support plate 406 may be fixedly attached to an annular ring 412 at the other side of the gimbals 39 bearing 408 although not depicted in fig4 in preferred embodiments the outer race 104 may be fixed relative to the support plate 406 such that the inner race 102 is moved along with the rotation of e g an antenna or the like while the outer race 104 is fixed relative to the antenna support or the like however in other embodiments the relative movements can be altered or otherwise selected depending on circumstances fig5 7 b show another hollow shaft fluid rotary joint 500 according to some preferred embodiments and implemented in one non limiting application with respect to fig5 this figure generally depicts the implementation of the hollow shaft fluid rotary joint 500 in a location so as to provide cooling capacity for an antenna 502 however it should be appreciated based on this disclosure that the hollow shaft fluid rotary joint 500 shown in these figures can also be implemented in other appropriate environments as shown in fig6 a and 6 b in this illustrative embodiment the hollow shaft fluid rotary joint 500 includes a modified structure it should be appreciated that features in the embodiment shown in fig1 4 can be combined with features in the embodiment shown in fig5 to 7 b that is elements from these embodiments can be combined freely depending on circumstances at hand for example in this second embodiment the hollow shaft fluid rotary joint 500 includes inlet and outlet ports 602.