From the size of the run you are talking about, I would recommend doing investment casting. You can build a mold out of aluminum, that will be used to mold a wax pattern. This wax pattern will be used to create a ceramic shell, and that will be used as the mold to cast the material. You can do investment casting in all sorts of steel, stainless, aluminum, bronze, just about anything you want. It really is affordable, and they can actually hold some pretty close tolerances.
Jim
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