A method for intercepting calls from a remote or mobile device for customer self-support detects when users or subscribers dial one or more predetermined numbers. In one embodiment, the device comprises a first member connectable to a first vertebra and a second member connectable to a second vertebra and interconnected with the first member. Collared pins disposed within the harvesters facilitate removal of the harvested cores. Part of the convex lens portion 8 surrounding the circular flat portion 11 is a convex-lens side face. A fluid injection member is adapted to inject a fluid tangentially into the separation chamber at a distance from the apex end which is at least 40% of the length of the separation chamber, such that the injected fluid increases the rotational speed of a portion of the vortex in the chamber to increase the separation efficiency with respect to fibres existing in the vortex portion. Substantially simultaneously recoil from detonation of cartridge together with the gasses in reaction volume drive breech block rearwardly against force absorbing spring.