Step 2: Securing the Print Heads and the Flat Table Using Retainers Use the retainer that was attached to the inside of the machine during its installation.ProcedureRemove the stored retainers A () and B ().Make sure to remove all five retaining screws ().Using the five retaining screws (), secure the print heads with retainer A () and the flat table with retainer B ().The machine is now ready to be moved.