Do not file the outside edge of the spur as this will affect the diameter of the bit.
2. Sharpen the chisel with a mortise chisel cutter with the correct size pilot. (Pilot size will differ
depending on the size of your chisel). Two or three turns of the cutter in a carpenter's brace
chuck should be enough to sharpen the chisel, as shown in Figure 8.
FIGURE 7
FIGURE 8
EN