IBM 3 User Manual page 238

10. Move the spacers along the tractor bar to support the width of the form.
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4247 Model 003 User's Guide
7. Close the right tractor door.
8. If necessary, slide the right tractor to the right side of the printer to remove
the slack in the form. If the forms are too tight, slide the right tractor away
from the right side of the printer. Ensure the tractor pins are centered in the
tractor holes.
9. While holding the right tractor in place, lock the right locking lever.
Spacers