illustration A method of hand sewing in
which groups of single sheets are sewn together
using a single length of thread which passes
through the paper and over the back edges of the
leaves. Overcasting is sometimes used when sewing
a book made up of single sheets, the "sections"
created being sewn flexibly. It is also a method
used by library binders when attaching new
endpapers to a book being recased, or to reinforce
the first and last sections of a book being
rebound without resewing.
Overcasting is a strong form of sewing, but it
results in considerable strain on the leaves and
frequently cuts the paper, partly because of the
diagonal at which the thread passes through the
paper. In addition, when groups of leaves are
overcast and then sewn on cords or tapes,
unsightly gaps are seen between the "sections."