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When we turn the nut, we raise or lower the bob.
我们一转动螺母，就会升高或降低摆锤。
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Grasp upper and lower stem lock nut with wrench and loosen.
用扳手抓住上部和下部阀杆锁紧螺母并且松开。
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Grasp upper and lower stem lock nut with wrench and loosen.
用扳手抓住上部和下部阀杆锁紧螺母并且松开。
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