Yakagadzirwa nesimbi yakakwira kabhoni, mubato wechirauro wakareba, chiredzo chinopinza chakapinza, kurwisa kwecorrosion kwakasimba, uye mwero wekudyisa hove wakakwira.Mubato wehoko wakagadzirwa maererano ne mechanical musimboti kudzivirira kukweshana pakati pemutsara uye hoko yepamusoro, iyo inoderedza zvakanyanya mukana wekuputika kweshinda uye ine kugadzikana kwakasimba.Imwe neimwe inopinza hoko tipi inokwenenzverwa kakati wandei kuti ive nechokwadi chekupinza kwechirauro, icho chinogona kuzadzisa mhedzisiro yekukurumidza kupinda nekumhanya kwakadzika kwekupinda kureba.Muchiitiko chekusawedzera mutsara wehuku uye uremu hwemuviri wehuku, kushushikana kwenguva refu kwehuku kunoshandiswa zvikuru.