Yes sir, it is the spindle nut pin anchoring the nut to the bottom of the vise. I will opt for cold rolled steel over the drill rod, since the hole in the nut appears to now be oblong. The pin was broke when I obtained the vise. Half was in the nut and the other have still in the vise base...
I am restoring a Wilton 1645 Mechanic's Vise, unknown date of manufacture. The pin securing the spindle nut was broken. It appears to be 3/16" diameter and was about 1-3/8" long. What type of metal pin should I use? Soft vs hardened metal.