Thanks guys, especially Rohmell for his tip on Harbor Freight; yup Rohmell, I do have a HF nearby, I'll get over there tomorrow. That way, I can use one of the taps to positively I.D. the thread in the nut that I have. I have a 6 x 1 tap and that is not the thread; it is finer. With the correct thread, I can make new studs using a better grade of steel and I will buy a HS steel quality die for that job! I'll probably make four new nuts, a bit larger in diameter and drill them for safety wiring--then they will never come off!
Thanks again guys.