I would profile a grinding wheel for that job but you can do it the tedious way with a file that has a smaller radius. Maybe a rod with sand paper to finish.
I sent you a PM with a e-mail that may help."If anyone knows how to describe the file I am needing, I would be grateful".
Thanks. I ordered a 12" round rat tail file smooth cut because it is tapered. I may be able to slowly sneak up on the desired radius with it, then use slip stones for the final shape. At least I hope.I sent you a PM with a e-mail that may help.