There's two black pieces - one has to come out first and the other comes out with the tumbler. The black piece that has to come out first is the black cover around the ignition. It is about 3 inches high and maybe 4 inches wide, it has retangular corners. It comes out by prying gently with a small screwdriver or the such. The second black piece is circular just around the tumbler. This comes out with the tumbler. The whole thing should come out easier when you push the wire tool in far enough - maybe an inch and half or two inches. Ignition key needs to be in position 1.

The trick to putting it back in is that even though they come out together, they go back in separately. First you put the tumbler alone in, but don't push it, just let it slide in, there's a large groove to line up, you can't screw it up. Then you push the black cover over it, and push them both in together, till it clicks in place, again there's a slot so it will only go one way. You line up the 2/3 ignition positions at about 2 o'clock.

Then you can test it - if it binds you need to put some lock lubricant on it. Then when it works you put the larger 3 by 4 inch cover back on. It's one of those jobs that goes very easily the second time you do it.