Holy smokes, I think the Tron joystick is a candidate for a FAQ...
Search for the other threads discussing the Tron joystick. It is an 8-way leaf stick with a diagonal restrictor. Oscar has pictures of the red restrictor on his site.
I just got a Xenophobe stick from eBay (It was on a Tron CP I purchase, I was pissed

when I got it... lol).
I'm considering trying to modify the stick because it looks like I could rotate the red restrictor and redrill the holes so that it is diagonally positioned like the original Tron stick. The modification wouldn't really hurt anything if it didn't work, so I'll probably try it when I get some time.
Oh, and as TH said, the purpose of this setup (the diagonal restrictor and the large actuator) is to soften the diagonals.
I totally agree BJ, if you go with the DOT spinner, you might as well get the stick!