Off topic? Machining some inserts

I am working on a project and ran into a stumbling block. I was trying to machine some parts on my junky 7X10 lathe but can't hold a reasonable tollerance in terms of concentricity. The part can be made out of any metal, brass or aluminum would be fine. (I was trying aluminum). The basic dimensions are 1/4" diameter by 1/4" long with a 2-56 threaded hole through. They might be a good candidate for a simple beginners CNC lathe project. I need 500 for the project. If made of brass they could be drilled #53 and I could take care of the threading.

If you would be interested in making these parts for me please contact me via email and we can discuss.

Thanks,

jack