EMPLOYEE WAS IN THE PROCESS OF CHANGING THE CONNECTOR LINK ON THE BOOM ENS OF THE BUCKET CYLINDER ON 757 PAGE DRAGLINE. WHILE ATTMEPTING TO GUIDE THE CONNECTOR LINK AND CYLINDER AS IT WAS LOWE RED INTO THE BOOM CHANNEL, THE CONNECTOR LINK ROTATED AND SMASHED THE EE'S LEFT RING FINGER AGAINST A FITTING ON THE CYLINDER. CAUSED LEFT RING FINGER TO BE LACERATED.