From this thread: http://www.classicrotaryphones.com/forum/index.php?topic=1979.msg256215#msg256215 (http://www.classicrotaryphones.com/forum/index.php?topic=1979.msg256215#msg256215)
(http://www.classicrotaryphones.com/forum/index.php?action=dlattach;attach=261348;image)
(http://www.classicrotaryphones.com/forum/index.php?action=dlattach;attach=261332;image)