I start with the file in question, a blank of maple or other hard wood 1 1/4" x 7" and a 1/2" long section of copper pipe for a ferrule. Be sure the ferrule is deburred on one end.
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Mount the blank between centers and snug it up.
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Turn it round with the roughing gouge.
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Using the guide lines from Milton and Wohlers, mark out the main diameters on the blank. Include the center of the cove section which goes down to 3/4". Just mark the beginning of the section for the ferrule.
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Mark the other end of the ferrule by holding the ferrule to the work. It is easier and more precise to measure from the piece rather than with a ruler or tape.
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