A spinal fusion implant for implantation between adjacent vertebrae is formed in the approximate shape of a hollow cube. The latch strike retention assembly includes a generally \u201cU\u201d shaped spring member having spring legs operatively connected to bushings arranged in converging opposing relation to one another and adapted to engage and retain a strike member disposed in opposing relation to the strike retention assembly. The instrument station has an inner specific diameter and is attached to a pipe with an equal inner diameter. The system periodically compares internally captured images with the saved reference and provides automatic image correction if the variation from the reference is within a correctable range. A hydrodynamic oil film is located between the sleeve and the shaft, wherein the hydrodynamic oil film allows the shaft to spin at greater speeds than the inner race track.