IBM 3 User Manual page 256

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4247 Model 003 User's Guide
7. Open both of the tractor doors.
8. Mark the perforation using a pen or pencil with a bright color, such as
red.
Note: If you are using forms with a length less than 203.2 mm (8 in.),
you will not be able to print on the forms above the mark.
9. Insert the forms through the front tractor opening and push them up as
far as they will go.