Experimenting with Dos a Dos bindings I created three books with different binding techniques- Ethiopian Two needle binding, limp vellum long/link stitch binding and an In Boards Bradel binding.
DAS has videos for the Bradel and Limp vellum bindings.
Link for first of three videos on Bradel binding
https://www.youtube.com/watch?v=zjgvy73rgA4
Link for the limp vellum long and link stitch medieval binding
https://www.youtube.com/watch?v=gJY4SJipiIo&list=PLZbEml0uyM4sen4ziLemcFqb0dtFUnxHp