| http://www.w3.org/ns/prov#value | - Although a round pad 30 is preferred, the pad may be any shape such as square, octagonal, etc.In one embodiment shown in FIG. 5A, the end of the shaft 21 is configured with a concave head 22 and hex-shaped flange 39 to form part of a ball and socket type swivel joint for the pad 30.
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