Why not epoxy the pins in the little nut jig. If I am thinking right you could epoxy one side of each pin and ditch the paperclip. One side on the pin that goes between the 2 nuts and epoxy the side of the pins that goes into the frame. It still should swivel.
Or if you have a tap get a block of aluminum and tap the side for a bolt and the top for the all thread rod. Do the same in a smaller block and carefully cut a bolt that will thread into the sides of each block.
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