A mechanism for regulating the external surface of an elastically deformable metal shell includes a temperature control for controlling roll sections and thus pressure controlling for controlling bending of a roller. The assembly provides a press roller with one or more pressing members for regulating nip pressure of a press roller against a counter roller. The assembly also provides a suction box with a mechanism for pressing it against a counter roller and a mechanism for pressing the counter roller against the box. The pressing mechanism are pressurized by use of a silicone elastomer compound which is in turn preferably pressurized by heating.