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| Clamp holding fixtures on ends of hoisting cables. |
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| Control the viscosity and weight of the drilling fluid. |
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| Guide lengths of pipe into and out of elevators. |
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| Inspect derricks for flaws, and clean and oil derricks to maintain proper working conditions. |
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| Inspect derricks, or order their inspection, prior to being raised or lowered. |
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| Listen to mud pumps and check regularly for vibration and other problems to ensure that rig pumps and drilling mud systems are working properly. |
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| Position and align derrick elements, using harnesses and platform climbing devices. |
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| Prepare mud reports, and instruct crews about the handling of any chemical additives. |
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| Repair pumps, mud tanks, and related equipment. |
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| Set and bolt crown blocks to posts at tops of derricks. |
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| Start pumps that circulate mud through drill pipes and boreholes to cool drill bits and flush out drill cuttings. |
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| Steady pipes during connection to or disconnection from drill or casing strings. |
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| String cables through pulleys and blocks. |
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| Supervise crew members, and provide assistance in training them. |
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| Weigh clay, and mix with water and chemicals to make drilling mud, using portable mixers. |