pin stuck in steering coupling

it is a spring pin, they at hard spring steel. Not sure if cobalt will drill them. Good chance you would break a bit. If it is sticking out you should be able to start it with a direct hammer hit. Then push it through with a punch. I sometimes compress them by grabbing the sides away from the slot with a vice grip. that will help break it free if rusted to the surrounding metal. Use PB blaster or other penetrating oil.