Official Answer
Answer
Impeta ya spiral yateguwe hamwe na '' notch notch '' imwe cyangwa impande zombi z'umugozi. Aka gatabo gatuma icyuma cyogosha cyangwa amenyo yinjira inyuma yimpeta kugirango ayakure muri ruhago. Ahantu hafunganye aho axial igarukira, impera ya 'slotted' cyangwa 'umwobo' irashobora gutomorwa. Ku nteko zitagomba na rimwe gusenywa, hashobora gukoreshwa igishushanyo mbonera. Abashushanya bagomba gushyira ikibanza mu cyerekezo gishobora kugera kubatekinisiye babungabunga, cyane cyane mu mwobo wimbitse aho impeta ishobora kuba ifite santimetero nyinshi imbere yinzu.
