Canon imageRUNNER 6570 Reference Manual page 280

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Adjusting the Machine
Select the paper size for which you want to adjust the saddle
stitch position.
NOTE
Some of the paper sizes displayed may not be available in certain countries.
Press [▼] or [▲] to adjust the saddle stitch position ➞
press [OK].
The adjustment range is from -2.0 mm to +2.0 mm in 0.25 mm increments.
The selected mode is set.
Press [Done] repeatedly until the Basic Features screen
appears.