I couldn't get the wheel out of the assembly, but I was able to spin it with some compressed air. I didn't get it on video, but a big chunk of dust came flying out.

I apologize in advance for filming in portrait mode. Also, I failed to get a shot of the debris inside the wheel.

That spring on the bottom in the first picture will probably fall off. Make sure to keep track of it.

I took the assembly apart in an effort to get the wheel out - no dice. I don't know where this oddly shaped spring goes, possibly on this peg, but I left it out and it doesn't seem to be important.