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J-39442 is a hardened steel Adapter which fits into the Main Shaft or Counter Shaft End to protect the Shaft during disAssembly. J-39442 is designed to supply a press contact for service to the Main Shaft or Counter Shaft. J-39442 is Installed into the End of the Main Shaft or the Counter Shaft during disAssembly. A hydraulic press is used to remove Bearings or Gears, by contacting the surface of J-39442 to apply Pressure for disAssembly.