The new innovation is a fast configuration of the slab thicknesses ; no need to introduce any spacer! By this system, the two back flywheels (one motorside and one tensioning side) are always fixed (they cannot be axially The other four couples of single flywheels can be axially adjusted independently each other through the use of a manual precise The operator can set the distance between each flywheel, both on motor and tensioning side, through a manual mechanical adjustment. Depending on thicknesses configuration, he just needs to move easely four, three or two or simply one flywheel only......