How to tighten up loose French Link binding : r/bookbinding

Help needed!! First attempt at French link binding, is it normal to have a 3mm gap between signatures when the book is open? If not how can I go about fixing this?

Combined endsheets, Paper for bookbinding

Adventures in bookbinding by Makrame - Issuu

My first book binding! And I have some questions : r/bookbinding

How to Bind Single Pages or Sheets of Paper into a Book or Portfolio

How to Bind Single Pages or Sheets of Paper into a Book or Portfolio

Leather Binding: Terminology and Techniques

French Link looks off and is kinda loose. Thoughts? : r/bookbinding

Booker Prize Designer Bookbinders