A dual pole linear actuator includes a dual pole magnet assembly that is moved by providing a bi-directional analog DC control signal to a dual wound coil. The apparatuses generally include a first acquisition circuit, a second acquisition circuit, and a controller. The epoxy seals may soften and seal after being positioned, thereby forming an in-place hermetic or substantially hermetic seal. The coating may be polymeric such as an oligomeric polyacid polyester, a polymeric alkoxylated alcohol or a fatty acid polyamine condensate or it may also be a surfactant and may be used in the form of a suspension in an inert oil, such as diesel oil or kerosene which may be injected into a subterranean formation to inhibit the formation of deposits, e. The gasket may be positioned adjacent the rear walls or adjacent at least one aperture within the plate.