BO105 Holding Jam Nut To Torque

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Holding jam nut to torque or remove the main rotor hub studs on the bottom of the hub. 
Screw this on to the stud, hold a back up on the lower nut and tighten the bolt. 
Slide a socket over the large nut and torque to specs. 

ATA Chapter:
62-Main Rotor
Maintenance Type: