In at least some implementations, a retainer for a fuel system component having an electrically conductive portion accessible from the exterior of the component includes a retaining feature and a grounding feature. The apparatus includes a suspension assembly for a hard disk drive. In turn, the digital audio device sends a stimulus based on that input signal to the human user, who takes an action, usually in the form of an output signal, to characterize the stimulus that the user receives, based on the user’s perception. A perforation instrument is introduced through the sleeve access lumen to perforate the outer tissue layer to form an access perforation into the anatomic space while the applied suction stabilizes the outer tissue layer, whereby further treatment drugs and devices can be introduced into the anatomic space.