How to change the bag former of small vertical packing machine. Model 320.plastic bag.

KEY PIONT :1. MAKE THE BAG FOMER IN THE VERTICAL; 2. MAKE THE FILM BALANCE; OR 3. MAKE THE BAG FORMER IN THE MIDDLE.
For vertical packing machines: One bag former is one bag size.
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Pls i need help my machine has stop working, it displaying an error message on the sealing panel. All effort to reset it prove abortive.