The blade is driven into the dowel and held by friction,as you insert the tool turn it as it reaches the mouth of the shell and as it begins to cut push down and continue to turn. It is so simple and easy it defies description. The blade is narrow and at angled to a point it is a number 11. 3 or 4 small holes drilled into dowel and the blade is driven in with a hammer, gently to a depth about half way through the dowel.
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