Headset

Hi I am currently building up a frame and trying to do as much as I can by myself. I have already failed in that I couldnt get the headset cups into the frame (with cheap device bought off ebay!) so took into LBs who fitted the cups, I thought it would then be a simple case of fitting the rest together.....
Wrong! I have managed to put together (I think as the pretty poor instructions arent much use) correctly but the trouble I am having is with the split ring which centres the forks ie. you can see it! should you be able to see this? when I take the forks out I can push the ring together and it looks like it fits together very well but as soon as I put the spacer on and the stem it doesnt appear to sit in that well. The handlebars turn well etc but Im at a loss to see whether this is incorrect or not!
The headset is a FSA The Pig
Wrong! I have managed to put together (I think as the pretty poor instructions arent much use) correctly but the trouble I am having is with the split ring which centres the forks ie. you can see it! should you be able to see this? when I take the forks out I can push the ring together and it looks like it fits together very well but as soon as I put the spacer on and the stem it doesnt appear to sit in that well. The handlebars turn well etc but Im at a loss to see whether this is incorrect or not!
The headset is a FSA The Pig
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+ some other bikes.
The split ring def goes on top which is how I have it as it wont fit in any other way I will try and upload a pic.
Cheers
Parktools :?:SheldonBrown