They assist the springs in preventing the ship from surging, and they are also used to adjust the position of the ship along the jetty, especially when she is going alongside.
Luthumela umthombo ekukhuseleni inqanawa kugalelo kwaye iphinde isetyenziswe ukunyenyisa londawo inqanawa ingakwibhlorho ekumiswa kuzo inqanawa ingakumbi xa iza kuhamba ngosecaleni.