What is the thread like,I find they are usually damaged, particularly if a nut is missing. Somebody has tried to remove the wheel and couldn't get it off, damaged the thread and that is why the nut is missing? Try the nut from the other side before yo try getting a nut, and no Bunnings won't have one, might even struggle with a nut and bolt place. On an anniversary model I did up, one thread had been snapped off and the other damaged. I had to weld new threads on both sides. Another one I cut new 1/2 inch whitworth threads on it, that worked out quite easily
Last edited by NormK; 26/04/16 12:55 AM. Reason: added info