• Ifumbire ifite mesa nini-radian, kandi guhagarika ibyuma birakomeye. Igikoresho gishyigikiwe gifasha muguhindura imyenda.
• Uburyo bwo gukoresha ibikoresho byo kwisiga birumvikana cyane. Nubwo umwenda waba mwinshi cyangwa unanutse, niyo imyenda ifite buto y'umuringa, ntabwo yangiza imyenda na buto. Uzanyurwa nubwiza bwicyuma.
• Igishushanyo cya patenti yumuzunguruko, ituma isura yimashini yose itunganijwe neza, Ukeneye iminota 5 gusa kugirango ushushe.
• Bifite imashini ireremba hejuru yimashini, ni hamwe ningaruka nziza yo kuzigama.