Ubukhulu bodonga bunokuthiwa aumbhobho wentsimbi ongqindilili. Kukho amathandabuzo malunga noku. Kuxhomekeke kumlinganiselo we-diameter yangaphandle yombhobho wensimbi ukuya kubunzima bodonga lombhobho wensimbi. Ngokomzekelo, umbhobho wensimbi kunye nobubanzi obuyi-50 mm, i-10 mm inokuthathwa njengombhobho wensimbi obunzima. Nangona kunjalo, kwi-diameter ye-219 mm, i-10 mm ngumbhobho wensimbi obhityileyo kuphela. Inkcazo esisiseko yombhobho wentsimbi enodonga olungqingqwa ilele kwinto abathengi abambiza ngayo. Qaphela ukuba xa kuthengwa imibhobho yentsimbi enodonga olungqingqwa, abathengi kufuneka bacacise izinto zemibhobho yabo yentsimbi kunye nobude bombhobho wentsimbi nganye, kuba oku kubandakanya inani leenxalenye zoomatshini kunye nenkunkuma engeyomfuneko.

Emva koko kukho imilinganiselo ecacileyo yobubanzi bangaphakathi nangaphandle bombhobho wensimbi. Oku kufuneka kubalwe ngaphakathi kuba ezinye iindawo kufuneka ziqwalaselwe. Imibhobho yentsimbi eshinyeneyo, njengohlobo lwemibhobho yentsimbi eyenziwe ngoomatshini, ineendidi ezininzi. Abathengi kufuneka bayicacise into yokuba bafuna imibhobho yentsimbi engenamthungo eshushu-isolwe ngokushushu okanye imibhobho yentsimbi engqindilili yomthungo, kunye nemibhobho yentsimbi engqindilili etyhidiweyo kunye nemibhobho yentsimbi eshinyeneyo eyakhiwe ngokushushu. Ifom, inkcazo enokutshintshwa, ugxininiso olungenakutshintshwa.