AlanRail, Looks Awesome so for. However, and please understand I am just trying to help here, because it is amazing what you have done, but I have just done some research and I believe that these nuts are not a star shape, but they are are what is called a Slotted Hex Nut. Slotted hex nuts are nuts with portions cut out designed to be used with a cotter pin to create a locking mechanism. I have included the best picture I could find of the Niagara side rods, and a Picture of a Slotted Hex Nut.
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