ʻO nā wili ala hele ʻano yoke he mau wili nila a cylindrical paha i mākaukau e hoʻokomo ʻia me ka hoʻolālā lālani hoʻokahi a pālua paha. ʻO nā wili ala hele ʻano yoke he mau ʻāpana piha i haku ʻia me ke apo waho, kahi wili nila a me ka hui hale paʻahao a i ʻole kahi nila hoʻopihapiha piha a i ʻole ka wili cylindrical, me a i ʻole me ke apo o loko. Loaʻa nā wili ala hele ʻano yoke me ke apo o loko a i ʻole me ka ʻole. Hana ʻia lākou me ke alakaʻi axial o ke apo o waho a i ʻole me ka ʻole.
