A lock assembly for attachment to an enclosure door. The balloon is inserted into an intrapericardial space about a patient’s heart and is disposed about one portion of the patient’s heart. The carriage assembly telescopes on guideposts with a spring biasing the carriage assembly away from the base plate. The mixtures are combined and reacted to form an asphaltic polyurethane foam. The underfill layer is formed between the die and the substrate for die attachment, wherein the plurality of the drill holes are formed below the underfill layer.