Disclosed is a method and system for compressing and automatically expanding an expandable luggage case 2 comprising a ratchet mechanism 8 and a bungee cord 32, that is used to bias a locking mechanism, in the form of detents 54 that mate with teeth 44, in a locked position, and to bias a jack mechanism 14 for automatic expansion. The liquid cooling system may be positioned within the server module, and the hot plate may have a surface exposed to the enclosed room. For drilling holes perpendicular to the surface, the direction of the projected light beam is parallel to the axis of the drill bit. , and the amount of water-soluble particles eluted from the pad when the pad is immersed in water is 0.