IBM 3 User Manual page 242

13. Close the left tractor door.
14. Move the right tractor until the right tractor holes of the form fit on the right
15. Close the right tractor door.
16. If necessary, slide the right tractor to the right side of the printer to remove
17. While holding the right tractor in place, lock the right locking lever.
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4247 Model 003 User's Guide
tractor pins.
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.