| http://www.w3.org/ns/prov#value | - After the shank 12b of drill 12 is sized to provide the desired clearance with the adaptor bore 18, at least one helical or spiral groove or channel, such as indicated at 20 in FIG. 2, is formed along the shank 12b a distance from its free end slightly less than the length of the shank which will be received within the adaptor bore 18.
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