Ukutywinwa kweendlela ezimbini, ukuchasana nokuvuza kwesakhiwo sokutywinwa kabini, ubomi benkonzo≥Amaxesha angama-5000, ukuxhathisa kwe-corrosion, i-bore epheleleyo, i-torque ephantsi, ubunzima obulula, ukuvulwa komlambo ngokukhawuleza, akukho ukubilisa kweendaba.