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From what I can tell the ACORN pieces are the nuts that hold the assembly together. I guess they are alluding to the fact that if the nuts fail the whole dam break assembly falls off..... Resulting in the all too famous.... serious injury or death....disclaimer...
They guy I talked to at Harley said it's some bolt you can visually see to see if it's loose....Coming from a guy who struggles changing a light bulb, I have no clue!