| 摘要 |
The assembly (20) consists of an expander/spacer ring (46) with upper and lower horizontal sections (64,66), separated by an intermediate element (68). The spacer ring is located between flat upper and lower rings (42,44), each with an angled outer face (54,62) and with the lower ring extending radially beyond the upper ring. The two flat rings can float freely relative to the expander/spacer ring and are not fixed rigidly to it.
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