How do I get this part off?

Put the steering wheel back on without the horn button. Grab one of the spokes in the steering wheel to leverage against your socket wrench. Also if you have one of those "club" anti theft thingies, attach it to the steering wheel for extra leverage.

Remove the center nut from the shaft (27mm if i recall correctly), make sure you also get the large washer out from under the nut, then grab the hub and pull it off.

Easier with the wheel still attached to the hub ...

Thanks guys. I'll try pulling harder. Perhaps I can pull on it hard enough that I solve the problem of getting my rear window out.

when your front lip starts bleeding, your pulling hard enough!

Yeah, you may want to wear a helmet.

I've actually used a hub type puller.. if you can get something for it to grab onto, it worked to at least 'break it free'.

I've found that leverage and wiggling can move stubborn parts. I'd probably put the wheel back on the hub, loosen the retaining nut (but don't remove it!!) and then grabbing the outer edge of the wheel at 3 and 9 o'clock and pulling on each side alternately.

--DD

True Dave but has someone wound up the nut with the wrong spline on the wheel adaptor...seen it before.
Agreed that the wheel needs to be on there to get it moving however.