G'day Norm Machining nylon rod is a specialist field. I have had some experience in this.
A better solution may be available.
In my field, we have 'nylon shoulder washers'. These essentially 'mimic' nylon bushes used on lawnmower wheels.
I would need good measurements to investigate alternatives. But the clear message is: any nylon bush can be reproduced at an economical cost in the modern world.
Thanks Jack, the big problem is my low demand, probably a few hundred and that is too low for anybody to bother with. Also what is it that makes machining nylon a "specialty" I find it is good to work with and I thought that this delrin material had good wear properties. Cheers Norm