A live center or revolving center comprising a spindle, a main body and a seal rigidly supported at the mouth or front side of said main body, the improvement being that said spindle is supported on a taper roller bearing at its front side and another taper roller bearing at its rear side, said bearings being arranged back to back and housed in said main body, the inner cages of said bearings being spaced apart by an inner spacer rigidly supported on said spindle and the outer cages of said bearings being continuously equally loaded by spring means provided in the space between said bearings.
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