In accordance with common engineering practice a mild steel sheave with a plain bearing has a small brass bush let into its centre to form the bearing, because steel bearing on steel is liable to seize.
Ukulolonga okuqhelekleyo lwenjineli yocingo yenza unyamezelo, ngokuba inebrasi encinci iyekelwe esiphakathini ukwenza umthwalo ngokuba umtwalo wentsimbi ecingweni uthimbo luyafumaneka.