The most interesting, favorite books deteriorate in the first place. And how to get textbooks: students receives their classes for free, but at the end of the year should return, because their use is designed for 5 years. Extend the life of books can anyone, even a child, if he be accustomed to it and help to make a simple fixture. Among them the most necessary — press.
It consists of three steel plates, two racks and screw with handle (dimensions indicated in the figures). The upper and lower plates are rigidly connected uprights on which they are fastened by nuts. In the middle of the top plate drilled hole for the screw and two small under a fastener nut screw that is installed from the bottom. Middle plate also has a Central hole under the heel of the screw (as it rotates the plate rises or falls). Not to spoil the surface of the table, on which is installed a press, lower plate with two sides fixed the screws on the wooden plank.