A wet-etch composition may include: peracetic acid ; and a fluorinated acid; a relative amount of the PAA in the composition being sufficient to ensure an etch rate of : that is substantially the same as an etch rate of :. The work chuckinginserting apparatus 60 further includes a tracer mechanism which causes the axis of a conical surface defined by the outer surfaces of the chuck fingers 65 to be aligned with the axis of the insertion hole when the outer surfaces of the chuck fingers 65 are put in contact with the inlet of the insertion hole, and a pushing mechanism for pushing the work toward the insertion hole. The device also can place fasteners to hold the gastric wall and the esophageal wall secured together, thus forming a valve between esophagus and stomach.