1940-1947 HD Knucklehead SERVICE & REPAIR MANUAL With this manual, you will have instant access to the service/repair information when you need it. It is very easy to use, and provides you with all of the technical information- work procedures, part numbers, torque specs, exploded views, etc- you need to have when you are performing service/maintenance and repairs on your vehicle. You can view and print this manual on your desktop computer, laptop computer, or tablet.