A method for creating a plication within a hollow organ. The method uses an elongated member having an end effector attached to its distal end. The end effector has a substantially hollow housing, a fixed jaw extending distally from the housing, and a retractable jaw located within the housing. The method involves the step of inserting the end effector within an organ of a patient such that it is in contact with tissue. The method also involves applying vacuum through the elongated member so as to dispose tissue on the fixed jaw and at least partially within the housing. The method also involves creating a plication by sliding the retractable jaw so that it juxtaposes the fixed jaw.