Horn rod all the way through. There are "anti-vibration" thingies (soft rubber) in a couple of places - these are best fed in as you put the rod down. (check that they came out with the rod.)
With rod in place, use a thin piece of pine slat and bend it under the wheel edges and above the horn/light switch. This to keep it "down" in the steering column - as you work at the other end you invariably will push the light switch rod up - this prevents this.
Next on at the bottom is a spring.
Next is the two pronged "spyder" which has a square hole to match the rod.
Next is the c-clip "keeper" which engages a "slot" of sort made into the end of the rod.
Then the upper light switch body. The switch is best assembled to the light switch rod as a "unit" with lower and upper body halves together and the switch plate/harness pinned in between.
And the "bale" (bail?) holds it all in place.
Pix below. This pix shows the "tube type seal" which offers yet another place for the switch rod to get hung up while you're putting it down the center of the steering column.
