| 摘要 |
A side plate according to the invention includes a main body, a first cup-shaped feature formed of the main body, and a second cup-shaped feature formed of the first cup-shaped feature, wherein the second cup-shaped feature has a diameter smaller than the first cup-shaped feature and is oriented in the direction opposite the first cup-shaped feature. The first and second cup-shaped features form a frustum-conical segment extending generally outward from the main body. The frustum-conical segment includes a plurality of threads located about a length of a hole formed therethrough. A contact surface is disposed about the hole.
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