Gunning-in EBT mass filling, material was being filled from the top. Similarly, in gunning and fettling, metal is filled up. In EBT mass Filling, they fill from the top of the shell. In gunning, two people go in the front of the shell and they have huge rods which they insert inside the shell and fill the shell. Fettling -The roof is removed before this activity starts, and there is one fettling machine which goes inside the shell, the gun shoots in all directions and fill the material inside the shell, and then the roof is put back Gunning and fettling do not occur every time. While EBT mass filling happens before leveling, these to activities happen after levelling.