EE WAS SUPERVISING THE INSTALLATION OF A FLUID COUPLING IN THE LONGWALL TAILGATE DRIVE. THE COUPLING WAS BEING LOWERED INTO POSITION WITH A COMEALONG. HIS FINGER WAS SMASHED BETWEEN THE COUPLI NG AND THE SIDE OF THE TAILGATE DRIVE UNIT. THERE WAS NO DAMAGE OR IMPAIRMENT TO THE OPERATION OR THE EQUIPMENT. EE WAS WEARING METACARPAL GLOVES. HE PUT HIS FINGER IN A PINCH POINT AREA.