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When the two halves of the valvebody are separated, take the half with the steel plate still attached, remove the support plate with its two screws, and lift the plate off. Then carefully drill four holes in the stock plate (arrows); the one with the pointer (upper right) is enlarged to 3/16 while the other three are opened up to 1/8 inch. After you've drilled the holes, use some sandpaper and make sure there are no burrs on the plate where you drilled. Wipe or wash the plate in parts cleaner and let it dry.