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Their advantage over the helical gears is that the side-thrust of one half is balanced by that of the other half. This means that herringbone gears can be used in torque gearboxes without requiring a substantial thrust bearing.
Bradawl or Pricker. This carpentry awl has a beveled tip and is used to make pilot holes in wood for brads and screws. Bridle or Harness Awl. Used by leatherworkers to make holes in leather prior to stitching, this type has a diamond-shaped point and comes with a range of diameters to suit the work.Saddlerâs Awl.his carpentry awl has a beveled tip and is used to make pilot holes in wood for brads and screws. Bridle or Harness Awl. Used by leatherworkers to make holes in leather prior to stitching, this type has a diamond-shaped point and comes with a range of diameters to suit the work. Saddlerâs Awl.