EE WAS CHANGING BELTS ON SECONDARY CRUSHER. BEARING SPACER BLOCK WAS BEING PUT IN PLACE WHEN IT SLIPPED OUT OF EE S HAND AND PINCHED THE TIP OF HIS FINGER BETWEEN BLOCK AND FRAME. ALTHROUGHT E E WAS WEARING GLOVES THE RESULTING LACERATION CAUSED THE NEED FOR 3 STITCHES TO CLOSE THE WOUND.