Frequently Asked Questions...
How do I open the control cavity of my Epiphone Les Paul Special II?
I have unscrewed the screws to the control cavity, but I am having trouble getting the cover off. Can anyone give me help to open it?
Answer:
Slip a tiny screw driver at the corner of the cover. The reason it doesn't come off is because they are assembled too quickly and often, the finish is not completely dry.
Just put the mini-screwdriver in the slit (anywhere around the cover) and twist the screwdriver slightly while pushing down. Don';t forget to put a piece of cloth under the screwdriver in case you slip so as not to mar the finish.
In any event, it will pop out with the least amount of pressure and nothing will break 
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Control Cavity
Control Cavity - Wet basement protection, interior drainage plane
Progressive Cavity Pump
Sometimes referred to as an eccentric screw pump or simply a cavity pump, a Progressive Cavity Pump is a device that makes it possible to move fluid through a series of small chambers or cavities with the use of a rotor. This type of action makes it possible to control the flow of the liquid in a manner that ensures that the progress of the flow is consistent and easily managed. Pumps of this type are used in a number of different applications, including drilling for oil, water, and natural gas.
While there are slightly different design elements in different versions of the progressive cavity pump, most models feature a helical rotor along with a series of progressively smaller chambers or cavities. A stator, normally made from rubber, works in tandem with the rotor to create a secure seal. As the rotor initiates the movement, each of the chambers or cavities also move, filling with liquid as the rotation continues.
The benefit of this design is that it is possible to use progressive cavity pumps to move liquid along at a slower pace, while applying varying rates of pressure to the liquid. The wear and tear on the pump itself is kept to a minimum, since each succeeding cavity has only to deal with the rate of pressure related to moving the fluid into the next chamber. This helps to maintain a constant balance in pressure, while still providing the operator with a degree of control that is not possible with other types of pumps.
There are a number of different applications for the progressive cavity pump. In the case of oil wells, this type of device is ideal for pumping oil through a well and into storage containers. Many sewage systems make use of this type of pump as a means of controlling the flow of sewage and sludge through the purification process. It is not unusual for corporations that make use of large quantities of chemicals in their manufacturing processes to use a progressive cavity pump in order to make sure the exact amount of each chemical compound is employed in each lot of product.
There are other uses for the progressive cavity pump. Wineries can make use of the pump to move liquid through the distillation process at a measured pace. Shipyards and other marine centres often employ progressing cavity pumps as part of the process of lubricating engines and filling tanks with fuel. A pump of this type can even be used in construction projects to move cement and grout into position.
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