Here it should be noted that the rods valves should not reach edges 20 cm, and, therefore, on the basis of the length of the plates, the length of each Rod will total 460 cm.
Kufanele kuqashelwe ukuthi izinduku valve akufanele ukufinyelela imiphetho 20 cm, futhi, ngenxa yalokho, ngokusekelwe ubude plate, ubude stem ngalinye kuyoba 460 cm.