IN PREPARATION FOR REMOVING BELT FROM THE LONGWALL BELT TAKEUP, 2 EMPLOYEES WERE SETTING UP THE HYDRAULIC BELT WINDER. THEY WERE PREPARING TO SET THE WINDER CORE BAR IN PLACE. ONE EE LET GO OF THE BAR BEFORE THE OTHER CAUSING HIM TO LOSE CONTROL. THE HEAVY STEEL BAR SLID & CRUSHED EE'S RT MIDDLE FINGER AGAINST THE BELT WINDER.