A torque-transmitting, variably-flexible insertion device includes a hollow body having a proximal end with an entrance for receiving an instrument and a distal end with a tip for protrusion of the instrument. Effective pitch of the helical gear mechanisms and the ratio of rotation coupled by the transmission are chosen to maintain the intermediate mold members centered in or offset from center in the separation between the movable platen and stationary platen. Then, an oxide film is gap filled in the trench, the oxide film is planarized, and the nitride film and the buffer oxide film are removed to expose an active region of the semiconductor substrate. An adjustable geometric connector having an externally serrated base is received and retained within the sectioned cavity. A cell electrical node is disposed on the cell active region adjacent to the cell gate patterns.