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which part is not fitting correctly on this diagram?
No, the part that I am having trouble with is behind the rinse dispenser and hidden by the white triangle shape (I think the cover of the mechanism). This diagram shows none of the parts that I am trying to put back together.
I found a video that may help. https://www.youtube.com/watch?v=WhpV8p36sd4 let me know if that helps.
It looks like it will solve my problem. I have reassembled the mechanism according the the video directions. I am running the dishwasher now and will let you know how it works.