Connecting bolts are arranged in the plugging conical points, and an anti-rotation key and an outer six-square sleeve which can realize the linkage are arranged on the screw bolt.

封堵内置有连接螺栓，螺栓上设有防转键及实现连动的外六方套。

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While their superstar's been recovering, the Bulls have seen just about every key part of their rotation get banged up at some point, yet they're still standing.

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The key may be how the rebuilt starting rotation holds up until ace Johan Santana returns in midseason.

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The importance of watching for sector rotation was reinforced in 2011 when many of the key sectors saw double-digit gains and losses from one quarter to another.

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