How to Tie One Thread to Another « Making A Byzantine Codex

How to Tie One Thread to Another « Making A Byzantine Codex: "How to Attach one Piece of Thread to Another April 9, 2010
When sewing the textblock a binder frequently finds him/herself without enough length of thread to complete the work. What to do? Well, the binder must attach another length of thread to the end of the previous one so that he/she can continue uninterrupted.

The images below demonstrate one popular method of doing this (I’ve had to use it a lot). I don’t know what method Byzantine binders used—the sources do not say as far as I can tell, but I imagine it was not too different."