| http://www.w3.org/ns/prov#value | - If the weight of the tool 18 is not great enough to bring the tool 18 and bushing 22 to the position illustrated in FIG. 4, a drill collar or other weight may be applied to the top of tool 18 to overcome friction between the seals 20 and the outer surface of casing stub 11 in order that the tool face 25 is placed face-to-face on the hub face 16.
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