| http://www.w3.org/ns/prov#value | - Loosening the nut permits lateral motion in a downstream direction of the moveable section relative to the fixed section to a second position (FIG. 6) to provide a gap 128 therebetween. [0077] Moveable sections 120, 126 include respective gas port 130, 131 having inlets connectable to a gas source, for example compressed air, and outlets which respectively release the gas into an outer cavity 132
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