GBC AdvancedPunch Pro Service Manual page 222

9. Rotate the Stop collar.
If the Punch Cam needs to stop earlier, rotate the Stop Collar
Clockwise (when viewed from the rear of the machine).
If the Punch Cam needs to stop later, rotate the Stop Collar Counter-
clockwise (when viewed from the rear side).
In this instance the cam needs to stop earlier, therefore rotate the
Stop Collar Clockwise (when viewed from the rear side). This is done
by manually lowering the pawl and freeing the Stop collar to rotate.
Repairs/Adjustments
10. Release the Pawl and slide the Stop collar back to its position.
11. Manually rotate the pulley in the counter-clockwise direction (viewed
from rear side) to complete a punch cycle.
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GBC AdvancedPunch Pro