I do have a spare Tsudakoma (they have always been the prime supplier for Okuma). They are setup as a full 4th with an air brake. Finally turned one machine into a parts machine, figure I have another year or two out of the other one. Give me a call at 512-698-5549 to discuss.
I came across a post of yours asking about your 4th axis in your Okuma. I am wondering what 4th you have (RNCX?) and if you'd be willing to get rid of it if you still have it. I am actually in College Station and just started up a shop and have two Cadet V's that I haven't been able to find compatible rotaries for. I'm about to have a RNCM 251 up and running with a Fanuc single axis controller, but a full 4th would be NICE.