I just had mine apart because it had gotten so stiff. The shaft needed cleaning and lubed and there is no way you can spray anything to lube it. It is a fairly involve process. I used a puller to get off the steering wheel, but I actually pulled the rubber steering wheel off of it's molded in hub. I trimmed the rubber edge, sprayed some sticky form a gasket in the wheel's hub, and pressed in the center bushing. You have to disconnect the dash and most of the harness connectors. The tilt mechanism is a bit tricky to get back together with the springs and such.
It totally fixed my "tight steering" problems. A cheap but difficult lube job.