Aya mavharuvhu anoshandiswa kugadzirisa kukurumidza kwevagadziri mune imwe nzira; kuyerera kwakasununguka mumashure .
Kutsikirira muripo hakuna kupihwa, kuyerera kweyero kunoenderana nekumanikidzwa uye mafuta viscosity. Aya mavharuvhu anoratidzirwa nekururamisa kwepamusoro.