Steering Column Collar Install

Okay, great pic. Thanks

Well, I'm baffled. My bottom collar does not have a hole to allow access to a set screw. Nor is there a hole to insert a set crew on the inside of the collar. The collars have been sandblasted so I'm certain there's no hole hiding under any paint, grime, or grease. Maybe the collars, or the entire steering column, are from a year model that I'm not familiar with.
So, I mocked up the bottom 2 collars onto the column jacket. I torqued down the 4 screws that hold the middle collar to the column jacket and also installed the return spring for the finger lever on the last collar. This does keep the bottom collar fairly stable, but theres still some movement. I dont mean the quarter turn rotation of the finger lever, I'm talking about some up/down, forward/backward movement.
At this point, I do not have a steering shaft tube in place, so I'm not aure if that will also provide some stability to the collar.