Hi Bill
It depends on where you buy the stainless joint. Some of them have a bigger i.d. thread wall than others.
Ex.
The pre tapered one's that Atlas sells have to have at least a .610 to .615 tenon which makes using hand dies a little more work. Where the one's from Ct. Cue parts will fit well with a .590 to .600 tenon.
Chris Hightower sell a brass tenon threader that works very well. I personally like the brass as opposed to the aluminum one's that are sold. It just cuts better. But it is harder to use this with a larger tenon. For the .600 tenon, it cuts great. You can alos get a regular steel split die, open it all the way and use this holder
http://www.wttool.com/index/page/category/category_id/14647/?utm_medium=cpc&utm_source=SiteChampion on a shank for the larger tenons. For all threading with hand dies, I use this lubricant,
http://www.woodcraft.com/Product/2000984/207/T9-Rust-Protectant-12-Ounce-Spray.aspx
Spray a little on a paper towel and apply it as needed, it helps a lot. Some also use wax.
If it's a new construction cue, leave the tenon for the pilot of the joint .002 larger that the pilot on the joint so it works for the alignment of the joint going on straight. Afterwards you can go in and bore it out and do your work to install your joint screw. Before you do any turning down of the tenon, make sure you indicate the joint sticking out of the lathe for accuracy. Hope this helps you.