| http://www.w3.org/ns/prov#value | - Set screws or keys (not shown), for example, or other appropriate means may be used to lock the nut 246 to the housing 240, the nut 252 to the sleeve 250, and the nut 264 to the wrench shank 260 so that each of these nuts may be used to selectively hold, fix or move the respective tubular element rotationally.
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