These are Illustrated Repair Manual Sections that were published by Thompson Products.

This covers mostly the Junior models, but the can be applied to other models as well.

Thanks to Dan Yocum, and his Estate for the donation of this content.

1940 Illustrated Tune-Up Repair Manual

It is recommended that you Right Click on the link(s) above and do a "Save Target As". This will download the PDF to your machine rather than trying to open and view it over the web.