i could use some centers machined for my Enkei track rims. the mechanical drawing shows the female hole detail of the RPF01 rim.

the smaller sizes don't come with center caps - they are special order.

probably could make work with Aluminum, but a Delrin or other HDPE would make a better snap-in.

<img src="http://www.velozt.com/elements/tech/sti/enkei-rpf1/enkei-rpf1-01.jpg">

<img src="http://velozt.com/elements/tech/sti/enkei-rpf1-centers/center-scheme.jpg">

imo, center caps are just potential track debris....

The Acetal - Derlin Rod is easy to come by. You may want to consider Black UHMW rod - it has a little UV inhibitor and is way more durable and impact resistant.

As far as sources for the plastic rod, I have a couple recommendations.
For the plastic rod, try:
Acetal/Delrin Plastic rod -www.iplasticsupply.com (http://www.iplasticsupply.com)
Delrin and UHMW rod - http://www.hightechplastics.com (http://www.hightechplastics.com)www.hightechplastics.com
For the lathe, this is something you want to find locally. Perhaps a quick listing on Craigslist looking for a local person with a lathe. It should be rather inexpensive to machine what you are looking for.