This comes up every so often, and gets discussed both ways: "Can one mount a steering wheel on a spinner shaft?"; and "Can one mount a spinner knob on a steering wheel shaft?"
The problem is that spinners have a short, thin metal shaft, and steering wheels have a longer, thicker shaft.
If you try to mount a steering wheel on your spinner shaft, a) the shaft may not even be long enough for the wheel to grab it; and b) the weight of the wheel will likely bend your spinner shaft, especially when you're yanking & pounding on it during gameplay.
If you try to mount a spinner knob on a steering wheel shaft, a) the shaft may stick out of the panel so far that your spinner knob will float far above the panel; and b) the amount of force needed to turn the large, heavy shaft may make gameplay akward.
It's been suggested that some kind of gear or belt-driven setup could be used, but as far as I know, nobody's ever done anything with that idea.
There is this thing, though:

That's a mini cab MinerAl did, he used a little mini-wheel- you could do something like that on a spinner shaft.
Link to MinerAl's site [urlhttp://lethargy.net/minicabpix/]here.[/url]