A method and apparatus for making cylindrical glass preforms with convex, optical quality convex end surfaces is taught. Thus, such system is configured to be operable under at least freeze start conditions. The hinge coupling consist of a fixed connector and a mobile connector, both pivotally connected to a middle link by pins. The processing unit may be positioned between the at least one roll and the lamination nip or may be positioned between the lamination nip and the winder.