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Clamp the carriage bolt with a vise (Image 1). Use a file to cut a 30-degree angle off the top of the bolt (Image 2). This will help get the die started in cutting the threads.
Place the die in the center of the die stock, and tighten it into place. Position the die over the bolt, holding the die stock perpendicular to the bolt.
Applying downward pressure, turn the die stock clockwise one or two turns. Remove the die and die stock. Brush away the metal chips, and repeat the process as needed to carve the desired amount of threads. Do not apply downward pressure after the first few threads are formed.