I will remember that. I got it to working again. I found out that there is a groove for that O ring. I also removed a couple pieces from another O ring in there so there were to I rings inside the body for some reason.
I installed the new one and still no change. Then I pulled it apart again and discovered the poppet was not moving freely. I had put the wrong O ring on it and managed found that it takes the real small ones in that kit. They are difficult to get onto the poppet.
Now it all works and the leak is fixed.