| http://www.w3.org/ns/prov#value | - The plug element comprises a cylindrical body with an external surface, the body adapted to fit snugly within one end of the tube, and the plug element having an axial shaft extending from one face thereof to drive or support the spool, the shaft being of plastic or other material, the other face of the plug element having axially extended therefrom one or more, and preferably two or more, elongat
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