Mitundu isanu ndi itatu ya mayendedwe a mpira ndi gawo lofunikira komanso lofunikira pazida zamakono zamakina.Ntchito yake yaikulu ndikuthandizira thupi lozungulira makina, kuchepetsa kukangana pakuyenda kwake, kuonetsetsa kuti kuzungulira kwake kulondola.Zimagwira ntchito yofunika kwambiri pakutalikitsa moyo wa makina.