I came up with another idea! Since I have a 3D printer, why not print my own nut (including slots)? This would be a challenge because the nozzle width of the extruder is 0.4 mm and I have to rely on my SketchUp skills to make a 3d model.

I can take over the dimensions of the stocknut that I took of the other day. I can go crazy and print a red nut... LOL!