A configurable input amplifier for position-measuring devices includes at least one amplifier unit, which has a first input and a second input, as well as a first output and a second output, and may be operated in at least two different configurations. The loading equipment has an operating implement for loading a payload, the operating implement being coupled to a support for movement relative to the support. The elastically deformable lug has two branches with a common root and extending in respective different directions, namely, referred to the insertion direction, a first or front branch extending globally away from the flange and a second or rear branch extending globally towards the flange. The same perforated interval in the wellbore is shot two or more times, using a conventional perforating gun in order to achieve a desired hole count over a shorter distance.