Ok this is as good as I can figure it out...
The yellow is the "spring" (Part 65)like half a paper clip thingy.
It tucks UNDER the blue.(PART 64)..looks not right but it seems to be ok.
the blue is the trigger return I think and the yellow spring pushes the blue up. Thats it.
My GBB skillz are probably as leet as my Photoshop skillz so beware.