Production of Tone Hole.
TOPPROCESSProduction of Tone Hole.

STEP2:Production of tone hole.

Production of head tube.

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Process the materials (silverware, gold) cut to tone hole size on the processing jig. After brazing, form a ring by hitting it so it fits onto the cored bar. After machine-processing, solder to the tube as a tone hole. Open a hole in a pipe section of the tube, and shape the surface of the tone hole by machine-processing.