
The dowel was a bit thinner than 3/4

Photo 1. Draw a template of the original bit on a flat surface. Make a center line and carefully mark the width of the original bit. You can then check the bit size as you file it to make sure you've removed the same amount from each side.

Photo 2. Clamp the bit firmly in a vise and file the side of each paddle the same amount with a medium file. Count the strokes as a guide for each side and then check it with your template. Drill test holes to make sure your dowel or tenon fits snug.

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