An endoscopic instrument having a lumen stabilizing feature, including a flexible shaft having a first distal end for insertion into the gastrointestinal tract of a patient, a plurality of arm housings disposed about the periphery of the distal end, a plurality of arms retained within the arm housings, wherein the arms may be extended from and retracted into the arm housings; and a finger connected to an arm, wherein the finger may be rotated with respect to a lateral axis of the arm. Lumen stabilizing accessories for flexible endoscopic instruments are also disclosed.