WHILE DISASSEMBLING ROLL CRUSHER DUST SHIELDS WITH IMPACT WRENCH THE OPPOSITE END OF THE DUST SHIELDS BROKE FREE CAUSING THE IMPACT WRENCH TO PUSH FORWARD. HIS LEFT 5TH FINGER WAS MISPLACED ON THE WRENCH AND WAS CAUGHT IN BETWEEN THE WRENCH AND THE DUST SHIELD. HE RECEIVED A FRACTURED FINGER AND RECEIVED SEVEN STITCHES. NO RESTRICTIONS.