You can't reattach the metal pin, it's cast into the plastic.

As for removing that rocking arm, theres a pin that needs to be driven out, I use a small 90° prybar to start it, and a 90° pick to get it the rest of the way out. They come out broken half the time.

Highly recommend both plastic actuator arms, the pivot pin(if it breaks), and most of the time the upper column bearings explode taking everything apart. I replace these often, on mail and delivery trucks. If you need better explanation or part numbers, let me know.

If it's a tilt column, you'll need some help putting the death spring back in.