Adjusting procedures
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Screw in bump stop until the paper strip can be easily pulled out.
Then unscrew bump stop until the paper strip cannot be pulled out any more.
Screw in bump stop until the paper strip can be pulled out "with slight resistance".
Version 4:
Lever out expanding rivets (1).
Remove bump stop (2).
Adjusting version 4:
Set bump stop to the correct height by turning to the left or right.