knocking out the groove
The process employed when rebinding a book that
was backed in the original binding, in which the
bend in each section caused by the backing is
removed. In library binding this is frequently
accomplished by nipping the book before the
sections are separated. In hand binding, one
method is to hammer (three) sections together on
the knocking-down iron, hut a more gentle (and
safer) method is to bend each section individually
over the edge of a board thus reversing the
hacking fold. In the latter method there is no
danger of disturbing the conformation of the paper
fibers, as can happen when the section is
hammered. (161 , 355 )
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