Steering Column Rebuild

OK, going back together..Im stumped. What holds the cast bearing case to the smooth column? I see the square headed bolts and they dont secure anything, they just pass through the cast case? Seems if I bolt everything back up, I could pull the steering shaft right out of the column with bearing retainer attached if it wasnt secured to the steering box.
Those square headed bolts are what hold it together. You have to back them off quite a ways and then slip the housing onto the tube. Get it oriented correctly and when you tighten the nuts for the square bolts, they wedge themselves into the corresponding slots in the tube.