| http://www.w3.org/ns/prov#value | - An assembly as claimed in claim 6, whereinsaid sleeve has a counterbore having a polygonal shape opposite said bore in said sleeve; said root fixture is formed with an open bore and a nut is fixed to said fixture at the open end of said fixture bore; said lower part of said connector element is a screw threaded through said fixture nut and extending into said fixture bore; and said sleeve polygona
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