This is the backside of the upper die cast housing. At left arrow, note the semi-circular grease smear. This grease smear is where this upper housing contacted the top edge of the painted steering column tube.

At the right arrow, note the triangular shaped boss. I believe this boss locks into a slot at the top edge of the painted steering column tube.

Back to the first photo: there is a small rectangular plate with a bump on it welded to the column tube. The upper die cast housing has a square hole in it (I suppose for the turn signal lever?). This is the undisturbed alignment of the bump to the square hole.

Don't forget, there is a large diameter wave washer and a round plate that sit in the I.D. of the top end of the painted tube. If you need more photos, holler.