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J-39743 is used with a press to Install the Main Shaft Bearing and the Counter Shaft Extension small Bearing. J-39473 contacts the Inner hub of the Bearings to prevent any damage to the Outer Bearing cage. J-39473 is used as a press Adapter for the Counter Shaft small Bearing. J-39473 is placed onto the Inner hub of the Bearing, and used with a hydraulic press to fully seat the Main Shaft Bearing or the Counter Shaft Extension small Bearing into place. J-39473 also is used to protect the Front End of the Shaft when servicing its components, and may be used with J-39442 to protect the back End of the Shaft.