TM 55-1520-240-23-5 6-16 ASSEMBLE DRIVE  SHAFT     (Continued) 6-16 7. Clean the splines of adapter assembly (12) and shaft (13).  Visually inspect splines for wear steps.  Wear step on any spline shall not exceed 0.005 inch. 8. Install bearing support (2) on adapter assembly (12).  Use arbor press and aluminum tube. 9. Check that length of spacer (14) is at least  0.60 inch.  If replacement is necessary, only a steel spacer shall be used.  Check with a magnet. Change 1 6-49