Video

In order to achieve consistency in coils in coil-basketry, it is useful to have a gauge. Here I will demo how to make a bone gauge out of the humerus (arm-bone) of a turkey wing.

You will need:
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hollow or hollowed out bone the desired diameter
cutting tool - like sharp stone, serrated knife, hack-saw, etc...
sandpaper or sandstone (optional)

With primitive hand-tool be sure to gently score the bone, then gradually increase the pressure as you cut a groove. For cylindrical objects, rotate the tube as you score/cut into it. Use sand-stone or sand paper to clean up any rough edges.