A technique includes receiving seismic data acquired in a seismic survey and performing quality control analysis on a given trace indicated by the seismic data. The method comprises placing inside the mold a module base with one or more receptacles for receiving permanent magnets, and inserting permanent magnets in the receptacles of the module base. Various prior art mechanical control linkages between a driver and controlled systems are replaced with non-mechanical control signal transmission components. The cylinder 53 is divided into a first volume 55 and a second volume 56 so that each piezo electric pump 51, 52 can pressurise one volume 55, 56. The second plurality of tabs is positioned for retention by said first plurality of tabs in such a way that the end plug is retained in the bore when subjected to the high pressure from high pressure fluid within the bore. The elastomeric compression pad is preferably composed of an electrically insulating material, such as a silicone-based gel.