An expandable electrical enclosure system is presented where expansion collars can be serially added to an existing base box to increase the dimension of the enclosure in only the Z direction. A bypass switch assembly is connected electrically in parallel to the first and second switch assemblies. In particular embodiments, ICV delivery may be of use for patients who have previously proven to be refractory to systemic administration of CNS agents, in some cases due to systemic side effects, or for those patients whose symptoms are of sufficient severity to warrant more aggressive therapeutic intervention. The force directing member is retractable toward and extendible from the adjustment member. The element shows low fog, high contrast, and high sensitivity. The abrasive sheet is preferably coupled within the recess.