Do yourself a favour and buy Delrin Acetal Rod. It turns like steel and has outstanding wear characteristics. Will probably outlast all the other parts of the mower. A little more expensive but worth every cent in the long run.
You could send member "Crumpet" a private message as he has previously made one for me and he was contemplating making a few for sale. Give him a try and see what he can do for you. If I recall correctly he is also in WA.
Cheers, BB.
I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.