THIS MECHANIC WAS REPAIRING A MANTLE FOR A CONE CRUSHER A PAD EYE WAS WELDED TO THE MANTLE & A T3 TON CHAIN COMEALONG WAS ATTACHED & PRESSURE APPLIED TO LOOSED THE 5G NUT HOLDING THE MANTLE TOGETHER. THE WELD ON THE PAD EYE BROKE THE COMEALONG WHICH THE MECHANIC WAS OPERATING HIT HIS RT SHOULDER. THE INJURY RESULTED IN A AC SEPARATION THAT REQUIRED SURGERY. A SAFER METHOD USING