EMPLOYEE WAS REMOVING A COUNTERWEIGHT FROM THE CAT216B SKID STEER. AFTER REMOVING THE 2ND OF 2 BOLTS HOLDING THE WEIGHT IN PLACE, THE WEIGHT SLIPPED OUT OF EE'S RIGHT HAND AND EE TRIED TO CATCH IT. EE WAS UNABLE TO STOP THE WEIGHT'S MOTION. PART OF EE'S RIGHT HAND WAS CRUSHED UNDER THE WEIGHT. EE SUSTAINED AN OPEN FRACTURE AND LACERATION OF THE END OF EE'S RIGHT RING FINGER.