I didn't use either the word "impact" or "triphammer", Bob. In fact if you look closely, you'll see that I used the word "pressure" which can be applied, as you say, by the momentus momentarius or the squeezus sustainus ha ha ha ha. Indeed the RotoForger may not be in the line of descent from whatever method and mechanism you're suggesting. What is? Hollow ram on the end of the mandrel that bucks up the edges of the spiral. Cmon, what ARE YOU talking about (in specifics of course)?

jack