@doodleintime you have looked in all the right places. It is not there. It is possible that the author had the best intentions but never got to that. The wiki you are quoting was created by a student and most like was part of an assignment.
I do recognize that this does not help you at all. I suggest you check something like this video to work on your device. It may not be the same model but usually it will give you an idea as to what to do. Take your time and be organized when you work on it. Take lots of pictures so your know how to put things back together.
You have now become the Pathfinder for this device :-) While you work on your wheel, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.
Repair is War on Entropy!
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