EMPLOYEE WAS LOADING DRAGLINE TRAIL CABLE ONTO THE REAR DRUM OF A CABLE TRUCK. A ROPE WAS LOOPED THREE TIMES AROUND THE PLM CONNECTOR. AS EMPLOYEE STARTED TO LOAD THE CABLE ONTO THE DRUM, HE T RIED TO ASSIST THE PLM COUPLER OVER THE LOADING BAR. HIS GLOVE CAUGHT ON ONE OF THE FOUR BOLTS ON THE PLM COUPLER PULLING HIS LEFT HAND INTO THE BAR FRAME, PINCHING LEFT RING FINGER.