| http://www.w3.org/ns/prov#value | - The spacers 18 are formed as long and thin linear shapes from a flexible material, such as silicone, which has little friction with the synthetic plastic from which the large diameter disk portion 22 is formed, and thus by housing the spacers 18 along the ring-shaped bottom guide groove 26, the spacers 18 are formed into circular arc shapes conforming to the bottom guide groove 26.
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