Have you finished your castings yet? If not you may want to try the lost foam method. Instead of wax you use Styrofoam or urethane foam. Then invest it just like the wax but instead of burning it out you direct pour the metal on the foam and have an instant burn out. Stinks like crazy but it works. I have cast some small parts for modelers of ships and planes with this method using pewter and zinc.
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