The Brass screw and nuts as used in connecting windscreens were commonly
used for book binding work with the threaded shaft section available in a
variety of lengths to match the thickness of the paper to be bound - suggest
you try a library or someone in the book restoration game-otherwise if you
can not locate come back to me and I will track down where I got them from
in Australia many years ago (1998)when I restored my car.
Yeoey (LM#262)