Steinberg Systems SBS-SEM-250 Manual De Instrucciones página 25

3.3.
Working with the unit
3.3.1 Installation of the pouch roll
Remove the crossbar from the supports (image above). Slide off one
of the stops, and slide the sleeve of the pouch roll onto the crossbar.
Slide the stopper back in. Fix the bag roll on the crossbar in such a
way that it will roll out from the top.