Umbhobho wohlobo lokucindezela, futhi uketshezi kufanele lube ngaphansi kwengcindezi yokusebenza ngokujwayelekile. Lolu hlobo lokunamathiselwe lungaveza ukuma kwesigaxa sokugcwala okugcwele okune-engela ebanzi nge-angle yokufafaza engaba ngu-60 ° -90 °. Lesi sesekeli sisekela ukwenza ngokwezifiso, sicela uxhumane nathi.