Drilling fixture assembly for Metaldyne flywheel part 5400643. Includes details for base plate, locating mandrel, and bushes with tolerances within 0.01mm; hardness 60-62 HRC for wear surfaces. – Base plate: 500x400x30 – Mandrel: dia. 90×67.5 mm – Locating bush: dia. 52.2×35 L – All dims in mm, 3rd angle projection.