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