Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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The folded edge at the head, tail, or fore edge of a section of an unopened book. Depending on location, it is known as a head bolt, tail bolt, or fore edge bolt. Bolts are generally located at the head and fore edge, but cannot be located at all three edges in any one section. The folded edge opposite the fore edge is not a "bolt," but a spine fold, or "last fold." Bolts are often opened quickly and with little care, resulting in ragged edges that are difficult to handle when turning leaves. A dull knife used carefully will result in a clean cut, while a knife that is too sharp is difficult to control and often cuts away from the bolt and into one or more leaves.

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