| http://www.w3.org/ns/prov#value | - providing a base and a hub, the base including a first cavity and a foot member, the first cavity including a first detent, the hub including a spring mechanism; inserting the hub inside the first cavity; mounting the hub to a planar surface; rotating the foot member along the hub; compressing the spring mechanism; and expanding the spring mechanism into the first detent. 9.
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