A manually-powered/-adjusted device assembly intended to be used to hold, maintain in a desired position, and enable positional adjustment of surgical and/or endoscopic instruments during an endoscopic examination/surgical procedure (i.e., during use). It typically consists of rigid or semi-rigid arms with joints, instrument holding and locking mechanisms, and a clamping mechanism for fixation to a stable object (e.g., the operating table) or is mounted on a mobile (on wheels) base.