Thanks for your response. We're specifically looking for a U.S. based precision caster who works with cast iron. however, we'll keep your contact information for a later project.
Don't know if this will help, but there is a company by the name of Lile Neilson who produces its own line of cast tools. They provide a very high standard of workmanship and produce what is felt by many as the best in the business. They do a wide variety of castings in bronze and cast iron. Don't know if they accept job shop work, but it might be worth a try. Good luck.
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