I plan to use a press brake bottom die as a "V" block. Then two
barrels clamped and held straight. Top one is just scrap for a guide.
bottom of top barrel bored out just a bit to hold the button. Put
button in bottom of top barrel and the long HSS push rod. Clamp it all
together in line. Press a bit, retract, put in short piece of HSS -
maybe 4", press a bit, put in another HSS stick, repeat.

Karl