| 21. | Gas lifted wells are equipped with side pocket mandrels and gas lift injection valves.
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| 22. | When the top is pulled on, the inner mandrel begins to slide upwards.
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| 23. | If the finish or form are critical then an eccentrically mounted mandrel is used.
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| 24. | In most cases, these mandrels are supplied with air pressure from different sources.
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| 25. | A special press is used in order to control the mandrel independently from the ram.
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| 26. | There are two common types of mandrels.
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| 27. | Original expanding mandrels have a slightly tapered wedge that will expand to hold the item.
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| 28. | With a mandrel, a draw plate can be used to draw tubes of metal.
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| 29. | Properly shaping the mandrel is not trivial.
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| 30. | The Verschoyle Patent Mandrel was invented by one of his relations, William Denham Verschoyle.
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