Isoko y'amashanyarazi yaka kandi igakomeza umuriro w'amashanyarazi hagati y'urutambi rusudira n'icyuma gikorwaho, ishongesha byombi ku buryo icyuma gifatana igihe gikonja. Imashini nyazo zitandukanye ku bwoko bw'umuriro zikoresha — urutambi rufite igishishwa, insinga ikomeza kwinjira, cyangwa urutambi rwa tungsteni rukoreshwa n'urundi rutambi rwuzuza — no ku ngufu z'amashanyarazi zishobora kwihanganira n'igihe zimara.