Perhaps a local college, technical or vocational school might be a good place to find someone willing to put a few dimples in your steel. Might make a valuable contact too. In my experience the teachers and instructors at such places are typically like minded and approachable. The two machine shops that I have attempted to make contact with have not been especially friendly. I don't represent enough dollars to them to be interesting. Which is fair enough of course, not a mutually agreeable arrangement I suppose. Hence the idea to pursue someone who's time isn't money and doesn't have a mortgage on his shop.