THE EE WAS ASKED BY ANOTHER EE TO HELP INSTALL SOME TROUGHING IDLERS ON C-5 BELT. THE EES WERE USING A CRANE TO HELP LIFT THE ROLLERS IN PLACE. THESE IDLERS WEIGH ABOUT 200# EACH. ONCE THE IDL ERS ARE IN PLACE THE EES WOULD SLIDE THE IDLERS IN PLACE ON FRAME. THE IDLER SLIPPED ON THE FRAME SMASHING THE RING FINGER ON EE'S HAND.