Ni irihe tandukaniro riri hagati ya rivets zo mu mutwe zidafite aho zihuriye n'iz'umutwe ...?

Ibyuma bidafite umutwe uzunguruka ntibikenera gushongeshwa, bizava hejuru nyuma yo gushongeshwa, mu gihe ibyuma bidafite umutwe uzunguruka bigomba gushongeshwa kuri dogere 120, kandi bizaba biri ku murongo umwe n'isahani nyuma yo gushongeshwa.