Thread and Beeswax
A book almost never falls apart because someone was careless with it.
The volumes that sit pristine and square-backed on a shelf for forty years are usually the ones nobody could quite finish. The ones that arrive on a repair bench with their mull split and their cloth hinges hanging by a thread are the books that lived in coat pockets through November rain, got propped open beside a soup bowl at dinner, and were lent to three different friends who each folded the pages back on the train.
Watching a bookbinder mend a book like that is nothing like watching a factory make a new one. Nothing gets thrown away if it can be saved. The old glue is scraped gently off the backs of the folded paper signatures with a warm blade; the torn folds are guarded with feather-thin strips of Japanese tissue; and then the whole stack is laid onto the bed of a wooden sewing frame where three taut vertical hemp cords wait to take the weight of the spine.
Before the curved steel needle passes through the first pinhole, the binder pulls a length of unbleached linen thread across a small round cake of amber beeswax—leaving another fine groove in the wax so the fibers won't fray as they draw tight or rot in the winter damp. An hour later, the original thumb-worn burgundy cover goes right back onto the mended spine, carrying every old crease from the first life into the second.