EMPLOYEE WAS INSERTING A PIECE OF 3"" PIPE INTO A HOLE IN THE SIDE OF THE PREHEATER TOWER. THE EE'S HAND WAS LOCATED ON TOP OF THE PIPE AS HE WAS PUSHING THE PIPE THROUGH THE OPENING. THE END OF THE PIPE INSIDE OF THE TOWER VESSEL TILTED DOWN AND PINCHED HIS FINGER BETWEEN THE PIPE ANDTHE SIDE OF THE POKEHOLE. EE WAS WEARING GLOVES.