Valavu wa mpira wamkuwa amalimbikitsidwa kuti mugwiritsidwe ntchito ndi makina amagetsi ndipo amatsimikizika kuti angagwiritsidwe ntchito ndi gasi lachilengedwe, lopangidwa, losakanizika, lozimitsidwa mafuta (LP), ndi zosakaniza za mpweya wa LP. Mavavu amiyala yamagesi amapangidwa mwapadera kuti apereke magwiridwe antchito osayerekezeka. Kuyambira pa tsinde mpaka thupi mpaka kapangidwe kake kapangidwe kake, chilichonse chapangidwa mwaluso kuti chitha kugwiritsidwa ntchito ndi kukhazikitsa.
Valavu yowongoka ya mpweya wamafuta imamangidwa ndi mkuwa wamphamvu, wolimba kuti upereke magwiridwe antchito ndi okhalitsa. Thupi lolimba lamkuwa limachotsa ziphuphu zazing'onoting'ono zomwe zimakonda kugulitsidwa. Tsinde lowulutsa lomwe lasonkhanitsidwa kuchokera mkati ndi O-mphete kuti zitsimikizire kuti ntchito ndiyotetezeka, yodalirika. Mipando imatsimikizira kusindikiza kolimba komanso kosavuta kugwira ntchito ngakhale patatha nthawi yayitali. Chitetezo chokwanira chimakhala ndi kuphatikiza kwa 'T' ndi mapangidwe amtundu wa lever. Chogwirira ichi chimatha kuyimitsa kuyenda kwangozi mukamenyedwa kapena kuphulika Ndipo valavu yamkuwa yamkuwa imathandizira kugwira ntchito kotala kotembenukira (madigiri 90) otseguka kuti atseke.