Steering column shaft question?

[WestButteTruck]

My steering wheel has play a little in and out so I decide to investigate the problem. Well, it looks like there is some sort of bearing on the end of the column where it comes out of the firewall and it has come loose? How does this fit on the end? Is it pressed in, or is there some other mechanism holding the shaft in place? It seems as though there should be a clip on the steering wheel side maybe. As it is, with the steering wheel off, I think I could just pull this shaft right out the bottom end. Any suggestions? How can I get this corrected? Thanks