weld 78 to the inner end of the right hand journal 34 and a second tube 80 is fixed by a weld 82 to the inner end of said left hand journal 32 the ends of tubes 76 80 are mutually connected by a center weld 84 the siphon tube 48 is hydraulically connected to the tube 76 which is blocked by a third siphon plug 86 but tube 76 is blocked by the first siphon plug 72 from communication with the annular journal passage 56 the tube 80 is in direct fluid communication with the siphon tube passage 62 but tube 80 is blocked by the second siphon plug 74 from communication with annular journal passage 68 extending radially outward from the axis 36 and fixed to the right hand journal 34 is a first riser pipe 88 which is in fluid communication with annular journal passage 56 similarly a second riser pipe 90 is fixed to said left hand journal 32 and extends radially outward from axis 36 the second riser pipe 90 is in fluid communication with the annular journal passage 68 located at the radially outer end of the riser pipes 88 90 is an inner shell 92 providing a circular cylindrical outer surface 94 the inner shell 92 is sealed and joined by a.