as shown in fig2 b on one end of the stub shaft a cylindrical shaft 32 is arranged rotatably via bearings 34 a support column 36 is arranged to the cylindrical shaft via self aligning bearings 38 which allow spherical movement to allow the deformation bending of the support element 14 in response to a heavy load one of the end walls 24 is fixedly attached to the cylindrical shaft a drive transmission 40 in the present embodiment a cog wheel is fixedly attached to the cylindrical shaft outside the end wall the cog wheel is connected to a transmission 42 and in turn a drive 44 a cog wheel 46 is fixedly attached to the cylindrical shaft inside the end wall a drive shaft 48 is arranged inside the jacket and parallel to the support element 14 the drive shaft 48 is supported by bearings 50 arranged in bearing houses 52 attached to the support element at each end of the drive shaft cog wheels 54 are arranged preferably these cog wheels have a prolonged toothed portion to allow axial movement of the intermeshing cog wheel which is attached to the end wall a further cog wheel 56 is fixedly attached to the second end wall 26 inside the jacket both cog wheels inside the jacket mesh with the corresponding cog wheel on the drive shaft the second end wall 26 is rotatably arranged on the second stub shaft 17 the second stub shaft is in turn fixedly attached to a second support column 58 the operation proceeds as follows during normal operation the driven heated roll 22 is in interaction with the fiber web and the flexible jacket 12 by a.