INJURED WAS ASSISTING THE CREW WITH THE PAR FOR THE #10 PRIMARY MILL. HE PUT HIS HAND ONT HE DECK LOCKING PIN TO REMOVE THE PIN, WHICH WAS STILL TIGHT & TILTED TO THE WEST. HE HAD THE PAR OPER ATOR MOVE THE PAR FORWARD TO RELEASE TENSION. THE PAR MOVED TOO FAR FORWARD & TILTED THE PIN TO THE EAST & PINCHED EE'S MIDDLE FINGER RT, HAND BETWEEN PIN & BLOCK.