Here is a manual for the Model C.
I have 3 of these clickers and have done 1/2 million clicks with them.
David
Ozzies Leathers
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=2ahUKEwiG1-u689LiAhUQEawKHWhUAIMQFjAAegQIAhAC&url=http%3A%2F%2Fwww.supsew.com%2Fdownload%2FUnited%20Shoe%20Machinery%2FUSC%20Ideal%20Clicking%20Machine%20Model%20C.pdf&usg=AOvVaw3XPO0JEA4j4W0vj8HaPGRs