Adaptive reconfiguration of a wireless receiver is enabled based on channel geometry. The inner membrane has one or more cut guides on an underside of the membrane arranged to locate adjacent the surface in use. In addition to the source fluid an auxiliary fluid is also injected which is able to etch non-crystalline silicon atoms. This provides interference such that the first layer of the strap cannot pass back through the hole. The microcavity is filled with a discharge gas under pressure which is excited by a combination of constant DC current and a pulsed current to produce radiation of the desired wavelength. A spring is positioned about a post formed by the cover to bias the brake body to a locked state.