Herding Cats
Hardplates
I think the stock needs to be turned undersize since rolling the threads would "expand" itI attended a sale of a shop that did thread rolling, they made fasteners. The thread rolling machines had 2 plates grooved to match the thread pitch, and the part was squeezed between the 2 plates, and one plate was moved laterally to roll the part between them.
I wonder what is involved to get set up to do that?