mending
A somewhat contradictory term which, in its most
elementary sense, refers to the minor restoration
of a book with no replacement of any material or
the separation of the text block from its case or
covers. In this sense mending is not so complete a
rehabilitation as RESTORATION . In a
more complex sense, however, "mending" can be a
long, involved process. The mending of torn
leaves, for example, in which the tears occur in
the folds, involves a process which necessarily
includes taking the book completely apart. (173 , 335 )