IBM 3 User Manual page 264

5. Stand facing the front of the printer. Hold the forms tractor with the tractor
6. With both hands supported on the round tractor shaft, gently push the forms
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4247 Model 003 User's Guide
doors toward you and the electrical connector tab on the right.
tractor upward until it clicks on both sides, the electrical connector tab is fully
seated in the connector, and the bottom of the forms tractor is level with (same