An employee was working on a pneumatic nut runner (air ratchet) equipped with a long extension to bolt seat rails to a bus. The employee was wearing gloves at the time. She was holding the air ratchet overhead with her left hand near the rotating ratchet head when the ratchet head and extension caught her glove, wrapping it around her left pinky and partially de-gloving it. Her left pinky finger had to be partially amputated.