Seti ya gikoresho cyo mu bwoko bwa helical gikoreshwa mu mashini ziterura ni ingenzi cyane kugira ngo ingufu zihererekanywe neza kandi neza. Imiterere yacyo yihariye ya helical igabanya urusaku n'ihindagurika ry'ikirere, bikongera imikorere muri rusange. Ubuhanga bw'iyi seti ya gikoresho bworohereza imikoranire myiza, itanga ubushobozi bukomeye bwo gutwara imizigo. Ikwiriye gukoreshwa mu buryo butandukanye bwo guterura, yizeza ko yizewe kandi iramba, bigatuma iba igice cy'ingenzi cy'imashini ziterura zigezweho.
Ibigo icumi bya mbere mu Bushinwa, ifite abakozi 1200, yatsindiye ibihangano 31 n'amapatanti 9. Ibikoresho bigezweho byo gukora, ibikoresho byo gushyushya, n'ibikoresho byo kugenzura.