Hi, I used to use thread rollers to thread spokes, both for bicycles, when I was young, and later, with six and eight gauge spokes for motorcycles. As far as I know, all spokes are still roll threaded, as that is a substantially stronger thread, and it allows for an effective heavier gauge in the thread, while the spoke shaft remains light. The thread rolling machines I used were hand cranked, with a set screw to tighten up one of the rollers, and they cranked right off, turning backwards. I expect you would have no problem rolling those stainless spokes, and using the rolls you have on your lathe would entail making a holder with three angled axles, at least one set up for tightening, and I'd run the lathe at slow speed while pressing the tailstock by hand, up against the job in the chuck, once the rolls start, they will pull the tailstock if it's loose. Definitely use lots of cutting oil, like knurling. The stock should be approximately the final pitch diameter, but I think there is a section in Machinery's Handbook that gives a formula for figuring out the proper diameter. Thread rolling is generally done on a screw machine, automatically, so tail stock mounting is generally the rule, as it allows fast retraction for the next screw. For what it's worth, Mad Jack