Does anyone know of a shim to use on a 5/8 seat post for a modern seat? Here is picture of a Brooks seat used on a 5/8 post- Post #50 at the bottom of the page
http://ratrodbikes.com/forum/index.php?threads/pre-war-elgin-a-new-project-begins.27807/page-3
http://ratrodbikes.com/forum/index.php?threads/pre-war-elgin-a-new-project-begins.27807/page-3