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A Chicago screw consists of an aluminum screw post that has a cap on one of the ends, and a screw that threads into it at the other end. The screw and the screw post both have big, flat heads to hold the pages when the two parts are screwed together. Pages and cover are simply drilled, and screwed together.
This binding is fine for small press runs, or a few books that will not get heavy use, but again, booksellers like a book that has the title on the spine, and these books do not have any printing on the spine. Some technical and how-to manuals benefit from this type of book binding and it is very convenient if you want to add or remove pages.