Adjusting the Saddle Stitch Folding Position
If you are using the optional booklet finisher, and you notice that the folds of the paper are not exactly in the middle of the booklet, use this setting to adjust the saddle stitch fold placement.
1
Press 
(Settings/Registration) 
<Adjustment/Maintenance> <Adjust Action> <Adjust Saddle Stitch Fold Position>.
(Settings/Registration) <Adjustment/Maintenance> <Adjust Action> <Adjust Saddle Stitch Fold Position>.2
Adjust the folding position.
3
Press <OK>.