Days 1 to 21 Not polished improper shape Cracks mproper winding spiral 1 21 15 20 not finished 10 Perforations 4 improper thickness 5 2 10 5 5 13 3 3 6 3 19 3 12 1 13 5 4 15 3 4 11 4 2 6 5 2 10 3 1 3 6 3 4 4 2 10 4 7 56 8 7 23 4 3 8 11 2 6 2 3 5 9 34 8 4 6 2 10 10 5 6 4 5 11 15 7 5 6 7 7 4 12 2 3 6 7 3 10 3 13 4 6 4 13 4 2 2 14 16 2 4 5 3 4 2 15 18 2 1 3 3 4 16 13 3 5 5 5 3 5 17 11 7 3 2 3 4 3 18 15 4 5 4 3 2 19 15 6 5 2 4 3 3 20 14 3 3 3 4 2 21 15 4 2 3 3 3 317 72 100 151 86 83 58