A medical apparatus and method useful for positioning a device, such as an endcap, on an end of an endoscope, is disclosed. The apparatus can exert a pulling force on the endoscope through the endcap while a pushing force is applied to the endcap. The apparatus can be used to press an endcap onto the distal end of an endoscope without grasping by hand a sheath in those applications where the endoscope is disposed in a sheath.