Sorry for necropsying, but I was doing some more reading today, and I came across this book called "Forty Centuries of Ink" by David N. Carvalho, and in the chapter titled "Ink Utensils", I found another point supporting the use of the blows of a hammer to temper the nib.
“The iridium for this purpose is found in small grains of platinum, slightly alloyed with this latter metal. The gold for pens is alloyed with silver to about sixteen carats fineness, rolled into thin strips, from which the blanks are struck. The under side of the point is notched by a small circular saw to receive the iridium point, which is selected with the aid of a microscope. A flux of borax and a blowpipe secure it to its place. The point is then ground on a copper wheel of emery. The pen-blank is next rolled to the requisite thinness by the means of rollers especially adapted for the purpose, and tempered by blows from a hammer. It is then trimmed around the edges, stamped, and formed in a press. The slit is next cut through the solid iridium point by means of a thin copper wheel fed with fine emery, and a saw extends the aperture along the pen itself. The inside edges of the slit are smoothed and polished by the emery wheel; burnishing and hammering produce the proper degree of elasticity.”