Remember that the function of the auger depends on the lead screw ■ a dragging the head of the bit into the wood. It's important to make sure that screw grooves are clean and sharp. Take a special bit file or a feather-edge file and work above: Hone the cutting lips but be careful not to damage the spurs.
above: Hone the cutting lips but be careful not to damage the spurs.
around the screw lead, sharpening up the thread. Don't overdo this stage, just make-sure that the threads are clean and defined.
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